By Brent Wallace

Longevity Doctors: What They Do, Cost, Credentials & How to Choose One

A growing number of people want to live longer. More importantly, they want to stay functional, independent, mobile, and cognitively sharp for as long as possible.

That demand has exposed a gap in traditional healthcare. Conventional medical care is excellent at diagnosing and treating disease, but it is not always designed around long-term healthspan, prevention, and aging-related risk decades before symptoms appear.

That is where longevity doctors come in.

A good longevity doctor does not promise immortality, “age reversal,” or perfect biomarkers. They use medical training, preventive care, lab interpretation, lifestyle medicine, and risk assessment to help patients make better decisions about how they age.

This article explains what longevity doctors do, how they differ from functional and concierge doctors, what they cost, which credentials matter, and how to evaluate one safely.

Medical note: This article is educational and is not medical advice. Talk with a licensed clinician before starting advanced testing, hormone therapy, peptides, supplements, prescription medications, off-label treatments, or major lifestyle interventions.

Hero image description: Illustration of a physician holding a tablet labeled “Longevity Doctors,” with a DNA symbol and 2026 stamp.

Quick Answer: What a Longevity Doctor Does

A longevity doctor should be a licensed physician, ideally board-certified in a primary specialty such as internal medicine, family medicine, cardiology, endocrinology, or another relevant field.

Their focus is not simply treating disease after it appears. Their goal is to help patients improve healthspan, reduce long-term risk, and stay healthier for longer through prevention, early detection, lifestyle medicine, appropriate testing, and ongoing monitoring.

There is no single official “longevity medicine” specialty in the United States. Many longevity doctors pursue additional training in functional medicine, integrative medicine, obesity medicine, age-management medicine, or continuing education in aging biology.

Costs vary widely. Some visits may be insurance-covered, while cash-pay longevity programs can range from basic annual memberships around $1,500–$5,000 to comprehensive programs costing $5,000–$25,000+ per year.

The best longevity doctors are transparent about what is evidence-based, what is emerging, what is experimental, and what may not be worth paying for.

Key Takeaways

A longevity doctor should be a licensed physician who focuses on prevention, healthspan, and long-term biological resilience.
Longevity medicine is not a single board-recognized specialty, so credentials and scope of practice need to be verified carefully.
Longevity doctors differ from functional medicine doctors, concierge doctors, and longevity coaches, although those roles can overlap.
Costs range from insurance-covered visits to several thousand dollars per year for cash-pay programs.
Not every patient needs advanced imaging, biological age testing, peptides, or expensive panels. A good doctor explains what each test will change.
Longevity doctors can complement coaches, dietitians, trainers, cardiologists, endocrinologists, and other specialists.

What Is a Longevity Doctor?

A longevity doctor is a physician who focuses their practice on prevention, healthspan optimization, and age-related risk.

They still practice medicine. They can diagnose conditions, order and interpret labs, prescribe medication when appropriate, and refer to specialists when needed.

The difference is orientation.

A longevity doctor usually prioritizes:

Early detection of risk factors
Better cardiometabolic health
Lifestyle, sleep, nutrition, exercise, and stress interventions
Risk reduction before symptoms become a serious disease
Long-term function, cognition, mobility, and resilience
Personalized monitoring over time

This approach fits within a broader shift toward preventive and lifestyle-based medicine. The CDC notes that many chronic diseases are driven by risk factors such as tobacco use, poor nutrition, physical inactivity, and excessive alcohol use.

The National Institute on Aging also emphasizes physical activity, healthy eating, sleep, regular healthcare, and mental health as important parts of healthy aging.

Longevity medicine should build on those fundamentals, not replace them with expensive testing alone.

Longevity Doctor vs. Functional Medicine vs. Concierge Medicine

These terms are often used interchangeably, but they are not the same.

Type	Definition	Key Distinction
Longevity Doctor	A licensed physician focused on prevention, aging, risk reduction, and healthspan.	Goal-oriented: optimizing how you age.
Functional Medicine Doctor	A clinician using a systems-based approach to identify upstream contributors to symptoms or disease.	Approach-oriented: how they practice.
Integrative or Holistic Doctor	A clinician who combines conventional medicine with complementary approaches when appropriate.	Philosophy-oriented: whole-person care.
Concierge Doctor	A physician who uses a membership or retainer model often has longer visits and more access.	Delivery-model-oriented: how care is accessed and paid for.
Primary Care Physician	A general medical doctor who provides routine care, screening, diagnosis, treatment, and referrals.	Baseline care and coordination; some are highly prevention-focused.

Functional medicine doctors often focus on root causes, systems biology, and personalized testing. Some longevity doctors come from this background.

Integrative doctors combine conventional medicine with complementary approaches. The NCCIH describes integrative health as the coordinated integration of conventional and complementary approaches.

Concierge doctors primarily change access and delivery. A concierge practice may offer longer visits and more direct communication, but it may or may not focus on longevity.

A longevity doctor may practice functional medicine, use integrative tools, and operate a concierge model. But longevity is defined by the goal: improving how you age.

Modern longevity medicine diagram description: Venn diagram illustrating how longevity medicine overlaps with functional medicine, integrative medicine, and concierge medicine.

What Services Do Longevity Doctors Offer?

Longevity practices vary. Some are physician-led primary care practices with a preventive focus. Others are comprehensive longevity clinics offering advanced testing, imaging, coaching, and ongoing monitoring.

The best practices do not test everything simply because they can. They explain why each test matters and how it will change the care plan.

Common Services

Service Category	What’s Included	Why It Matters
Comprehensive Testing	Blood panels, metabolic markers, inflammatory markers, thyroid testing, hormone testing, nutrient markers, or other labs based on symptoms, age, history, and goals.	Establishes a baseline and may identify risks that need follow-up.
Cardiovascular Assessment	Blood pressure, advanced lipids, ApoB, Lp(a), glucose/insulin markers, family history review, and sometimes coronary artery calcium scoring or vascular imaging.	Heart disease remains a leading cause of death in the U.S., according to CDC/NCHS.
Hormonal Evaluation	Thyroid, testosterone, estrogen, progesterone, cortisol, or other hormones when clinically appropriate.	Hormone issues can affect energy, body composition, mood, fertility, sleep, and long-term health, but treatment should be individualized.
Biological Age Testing	Epigenetic clocks, telomere testing, or other aging biomarkers.	These tools may be useful for tracking or research, but clinical interpretation is still evolving.
Advanced Imaging	Preventive MRI, full-body scans, coronary calcium scans, DEXA, or vascular imaging in selected patients.	May help selected patients, but broad full-body MRI screening is controversial for people without symptoms or risk factors.
Lifestyle Medicine	Nutrition, exercise, sleep, stress, alcohol, smoking, recovery, and relationships.	These remain the foundation of longevity care.
Supplements and Medications	Supplements, prescriptions, or off-label medications when evidence, safety, and patient-specific risk support them.	Can be useful in the right context, but should not replace diagnosis, standard care, or lifestyle fundamentals.
Ongoing Monitoring	Follow-up labs, plan adjustments, coaching, referrals, and periodic reassessment.	Helps translate insights into action and adjust the plan over time.

Not every patient needs every service. In fact, one of the most important signs of a good longevity doctor is restraint.

They should be able to say:

“You do not need that test yet.”
“This result is interesting, but it does not change your care plan.”
“This intervention is experimental.”
“Let’s start with the highest-impact basics first.”

What Longevity Medicine Can and Cannot Prove Yet

Longevity medicine includes both well-established preventive care and newer interventions that are still being studied.

That does not mean the field is illegitimate. It means patients need a doctor who can separate solid evidence from hype.

Area	What Is Better Established	What Still Needs Caution
Lifestyle Medicine	Exercise, nutrition, sleep, tobacco avoidance, alcohol moderation, preventive care, and chronic disease risk reduction are the most evidence-supported foundations.	Programs should not distract from the fundamentals by overemphasizing exotic tests or protocols.
Cardiovascular Prevention	Blood pressure, lipids, diabetes risk, family history, smoking, body composition, and activity level are high-impact areas to address.	Advanced testing should be tied to a clear decision, not ordered randomly.
Biological Age Testing	Epigenetic clocks and related tools are promising for research and tracking.	A 2024 Nature Reviews Genetics review notes that interpretation and application challenges remain.
Full-Body MRI	Imaging may be useful in selected high-risk situations or when clinically indicated.	The American College of Radiology states there is not enough evidence to recommend total-body MRI screening for asymptomatic people with no relevant symptoms, risk factors, or family history.
Peptides and Off-Label Medications	Some medications may be prescribed off-label when clinically appropriate.	Off-label use means the FDA has not approved that drug for that specific use. Risk, evidence, and monitoring matter.
Supplements	Some supplements may help in specific deficiencies or conditions.	Supplements should not replace diagnosis, standard care, nutrition, sleep, or exercise. Quality and safety vary.
Hormone Therapy	Hormones can be appropriate in selected patients with clear indications.	Hormone therapy requires diagnosis, monitoring, contraindication review, and risk discussion. “Optimization” should not mean pushing everyone toward the same target.

A strong longevity doctor should tell you what is proven, what is plausible, what is experimental, and what they would not recommend for you.

How Are Longevity Doctors Certified?

This is where things get nuanced.

In the United States, there is currently no single board-recognized specialty called “longevity medicine” in the same way there is cardiology, internal medicine, dermatology, or endocrinology.

That means any licensed physician can technically market themselves as a longevity doctor.

Because of that, credentials matter.

Common Backgrounds and Training

Credential or Training	Description	What to Verify
MD or DO	Medical degree for physicians in the U.S.	The physician should have an active medical license if they diagnose, prescribe, or practice medicine. Outside the U.S., verify the local equivalent.
Primary Board Certification	Board certification in a primary medical specialty.	Look for internal medicine, family medicine, cardiology, endocrinology, emergency medicine, preventive medicine, or another relevant field.
Functional Medicine Training	Additional training in functional medicine.	The Institute for Functional Medicine offers certification pathways, but this is not the same as ABMS board certification.
Integrative Medicine Certification	Additional board certification or training in integrative medicine.	The American Board of Physician Specialties offers board certification in integrative medicine through ABOIM for eligible physicians.
Obesity Medicine Certification	Additional certification in obesity medicine.	The American Board of Obesity Medicine certifies physicians in obesity medicine, which may be relevant for metabolic health and prevention.
Anti-Aging or Regenerative Training	Fellowships, courses, or continuing education programs.	These should be treated as additional education, not a replacement for licensure or primary board certification.
Continuing Education	Courses in aging biology, cardiometabolic prevention, epigenetics, hormones, exercise physiology, or nutrition.	Useful when high quality, but quality varies by organization and program.

The key point: longevity-focused training should supplement a physician’s medical foundation. It should not replace it.

How to Verify a Longevity Doctor’s Credentials

Before paying for a longevity program, verify the provider’s credentials yourself.

What to Verify	Why It Matters	How to Check
Active Medical License	Confirms the provider is legally allowed to practice medicine.	Use your state medical board website or the Federation of State Medical Boards.
Board Certification	Shows additional training and assessment in a recognized specialty.	Use ABMS verification resources or the relevant board’s official directory.
Osteopathic Board Certification	Relevant for DO physicians.	Check the AOA board certification through official osteopathic certification resources.
Primary Specialty	Helps you understand the physician’s clinical foundation.	Confirm whether the doctor is trained in internal medicine, family medicine, cardiology, endocrinology, emergency medicine, preventive medicine, or another field.
Additional Certifications	Helps separate serious training from vague marketing.	Verify IFM, ABOIM, ABOM, A4M, or other training directly through the issuing organization.
Scope of Practice	Clarifies who makes medical decisions.	Confirm who will diagnose, prescribe, interpret labs, order imaging, and handle follow-up.
Disciplinary History	Helps identify serious trust concerns.	Check state medical board records for disciplinary actions or license restrictions.
Provider Type	Prevents confusion between physicians and non-physician providers.	Clarify whether you are seeing an MD, DO, NP, PA, ND, chiropractor, coach, dietitian, or another practitioner.

This is especially important because many clinics use similar language for physicians, naturopathic doctors, nurse practitioners, physician assistants, health coaches, and wellness consultants.

That does not mean non-physician providers cannot be helpful. It means patients need to understand who is responsible for medical decisions.

What to Look For in a Longevity Doctor

Because the field is still evolving, discernment matters.

Green Flags and Red Flags

Green Flag	Red Flag
Active medical license in good standing	No verifiable medical credentials
Board-certified in a primary medical specialty	Vague about training or licensure
Clear about what they do and do not treat	Claims they can reverse aging or guarantee outcomes
Explains why each test is ordered	Orders large panels without explaining what will change
Discusses uncertainty and tradeoffs	Presents every intervention as proven
Collaborates with specialists	Discourages second opinions or standard medical care
Prioritizes lifestyle fundamentals	Leads with expensive add-ons before basics
Transparent pricing and follow-up	Unclear fees, hidden lab costs, or pressure to buy packages

A good longevity doctor should feel like a careful physician, not a salesperson.

Do You Need a Longevity Coach or a Longevity Doctor?

This depends on what kind of help you need.

Need	Longevity Coach	Longevity Doctor
Behavior change and accountability	Primary role	May support or refer
Lifestyle implementation	Primary role	Provides medical guidance
Habit formation and consistency	Primary role	May refer to the coach
Medical diagnosis	Cannot do	Primary role
Lab ordering and interpretation	Cannot do	Primary role
Prescription medication	Cannot do	Primary role
Hormone evaluation or treatment	Cannot do	Primary role or specialist referral
Advanced testing or imaging decisions	Cannot do	Primary role
Unexplained symptoms	Should refer to a physician	Primary role
Ongoing plan execution	Often helpful	Often helpful

A longevity coach focuses on behavior change, accountability, and lifestyle implementation. They do not diagnose disease or prescribe medication.

A longevity doctor practices medicine. They are essential when:

Symptoms are unexplained or persistent
Lab work needs deeper interpretation
Medication or medical testing is required
Hormones, imaging, or prescriptions are being considered
You suspect an underlying condition rather than a habit gap

In many high-quality practices, doctors and coaches work together. The doctor identifies what needs attention. The coach helps ensure the plan actually happens.

Many longevity clinics integrate both roles under one roof.

What to Ask Before Choosing a Longevity Doctor

Before booking, ask practical questions. The answers will tell you a lot.

Category	Questions to Ask	Why It Matters
Medical Credentials	Are you a licensed physician? What is your primary specialty? Are you board-certified?	Confirms the provider has a real medical foundation.
Scope of Practice	What do you treat, and what do you refer out? Who interprets my labs? Who prescribes?	Clarifies who is responsible for medical decisions.
Testing Philosophy	What tests do you typically order, and why? How do you decide whether a test is necessary?	Helps avoid unnecessary or poorly explained testing.
Evidence Standards	How do you separate evidence-based care from experimental interventions?	Shows whether the provider can explain uncertainty.
Care Process	What happens after the initial consultation? How often do we meet?	Determines whether there is meaningful follow-through.
Pricing	What is included in the fee? Are labs, imaging, coaching, supplements, or follow-ups billed separately?	Prevents surprise costs.
Coordination	Will you coordinate with my primary care doctor or specialists?	Helps avoid fragmented care.
Fit	Do I trust this clinician? Do they explain clearly? Do they listen?	Longevity care is usually long-term, so relationship fit matters.

Questions to Ask About Testing

Advanced testing can be useful, but only when it leads to better decisions.

Before paying for a test, ask:

What question does this test answer?
What decision will change based on the result?
Is this test recommended for someone of my age, symptoms, family history, and risk profile?
What are the false-positive or false-negative risks?
What happens if the result is abnormal?
Is this covered by insurance?
Who reviews the result with me?
Is follow-up included in the price?

If a practice cannot answer those questions clearly, be cautious.

How Much Does a Longevity Doctor Cost?

Costs vary widely based on the provider, location, testing, visit length, program structure, and whether insurance is accepted.

Some longevity doctors operate like preventive primary care physicians. Others run cash-pay programs with advanced diagnostics, imaging, coaching, and frequent follow-up.

Typical Cost Ranges

Service Type	Typical Cost Range	Insurance Coverage
Initial Consultation	$250–$1,000	Sometimes covered if billed as a standard medical visit.
Comprehensive Intake	$1,500–$5,000	Rarely fully covered.
Follow-Up Visits	$150–$500 per visit	Sometimes covered depending on billing and medical necessity.
Basic Blood Work	$200–$500 cash-pay	Often covered when medically necessary and ordered through insurance.
Advanced Testing	$500–$3,000+	Usually cash-pay.
Preventive Imaging	$1,000–$10,000	Often, cash pay is required unless medically indicated.
Basic Annual Program	$1,500–$5,000 per year	May be partially covered only if specific services are billed separately and medically necessary.
Comprehensive Annual Program	$5,000–$25,000+ per year	Rarely covered.

Common Payment Models

Insurance-based: Some doctors accept insurance for standard services, while advanced testing or coaching is billed separately.
Cash-pay or direct primary care: Patients pay a monthly or annual fee for access and visits. Labs and imaging may be separate.
Comprehensive programs: Patients pay a larger annual fee for testing, visits, interpretation, coaching, and monitoring.

HSA or FSA funds may apply to some medically necessary expenses, but not everything marketed for wellness or general health qualifies. The IRS says medical expenses generally must relate to diagnosis, cure, mitigation, treatment, or prevention of disease. Check your plan and tax advisor before assuming eligibility.

Higher cost does not automatically mean better care. What matters is appropriateness, transparency, clinical judgment, and follow-through.

Who Should Start With Primary Care Instead?

A longevity doctor can be helpful, but not everyone needs to start there.

Start with a primary care doctor or appropriate specialist if you have:

Chest pain, shortness of breath, fainting, neurological symptoms, severe pain, or urgent symptoms
Uncontrolled diabetes, high blood pressure, heart disease, kidney disease, or another active medical condition
Unexplained weight loss, persistent fatigue, bleeding, new cognitive changes, or ongoing symptoms that need diagnosis
A limited budget and no recent basic preventive care
No established primary care doctor

For many people, the highest-value first step is not a $10,000 program. It is getting up to date on preventive care, blood pressure, lipids, A1c, cancer screenings, vaccinations, sleep, exercise, nutrition, alcohol, smoking, and mental health.

The USPSTF maintains evidence-based preventive screening recommendations that clinicians can use based on age, sex, risk factors, and medical history.

Find a Longevity Doctor Near You

Finding a qualified longevity doctor can be challenging, especially locally.

Here are your options.

City-Specific Guides

We’ve compiled guides to longevity doctors in major cities.

United States	International
Austin	Bangkok
Boston	Dubai
Chicago	London
Las Vegas	Paris
Los Angeles	Singapore
Miami	Sydney
San Francisco
Seattle

Other Options

Longevity Clinics: Comprehensive facilities offering doctors, testing, and sometimes coaching under one roof.
Longevity Retreats: Immersive programs combining medical assessment with lifestyle intervention.
Telemedicine: Many longevity doctors offer remote consultations, although some testing may still require local labs or in-person visits.
Browse our marketplace: Search for clinics and providers by location and specialty.

How to Evaluate Local Options

If you are searching on your own:

Ask your current physician what preventive services they already offer.
Search for licensed physicians with preventive, functional, integrative, cardiometabolic, or age-management experience.
Verify credentials through state medical boards.
Look for practices that emphasize prevention, not promises.
Read reviews, but prioritize clinical process over testimonials.
Ask what is included before paying for a package.
Avoid clinics that pressure you into expensive testing before a real evaluation.

Longevity Doctors and Related Specialists

Longevity medicine often overlaps with other specialties.

Specialist	When to Consider	Relationship to a Longevity Doctor
Cardiologist	Strong family history of heart disease, abnormal lipids, high blood pressure, chest symptoms, coronary calcium concerns, or advanced cardiac testing.	May provide specialized cardiovascular evaluation or treatment.
Endocrinologist	Complex thyroid issues, diabetes, adrenal concerns, pituitary issues, or complicated hormone problems.	May collaborate on hormone or metabolic issues.
Obesity Medicine Physician	Weight, metabolic syndrome, insulin resistance, or medication-supported weight management.	May support metabolic health and body composition goals.
Registered Dietitian	Detailed nutrition planning, medical nutrition therapy, body composition goals, or condition-specific diets.	May translate medical goals into nutrition plans.
Personal Trainer or Exercise Physiologist	Strength, mobility, aerobic fitness, injury-aware training, or exercise programming.	May coordinate exercise protocols.
Mental Health Provider	Stress, anxiety, depression, sleep disruption, trauma, behavior change, or cognitive concerns.	May support emotional, behavioral, and cognitive health.
Longevity Coach	Habit formation, accountability, lifestyle execution, and long-term consistency.	Often helps implement the plan.

Many longevity clinics bring several of these professionals together in one practice.

What to Expect at Your First Visit

First appointments with longevity doctors are usually longer than standard medical visits.

Before the Visit

Detailed intake questionnaire
Medical history and family history
Lifestyle, sleep, nutrition, exercise, alcohol, smoking, and stress review
Prior medical records
Current medications and supplements
Recent labs or imaging, if available

Some practices request baseline labs before the first appointment. Others wait until after the physician has reviewed your history.

During the Visit

Extended consultation, often 60–120+ minutes
Deep dive into personal and family health history
Review of goals, symptoms, risks, and current habits
Discussion of lifestyle factors such as sleep, nutrition, exercise, stress, and relationships
Testing plan, if needed
Discussion of priorities and next steps

After the Visit

Lab orders or imaging referrals
Follow-up appointment to review results
Personalized plan
Referrals when needed
Ongoing monitoring schedule

The first visit is about understanding your baseline and direction. The real value comes from interpretation, prioritization, and implementation over time.

Frequently Asked Questions

What is a longevity doctor?

A longevity doctor is a licensed physician who focuses on prevention, healthspan, and age-related risk. They may order labs, diagnose conditions, prescribe medication, and help patients improve long-term function, resilience, and quality of life.

Is longevity medicine a recognized medical specialty?

No. In the U.S., longevity medicine is not a single board-recognized specialty like cardiology or internal medicine. A qualified longevity doctor should still have an active medical license and, ideally, board certification in a primary specialty.

How much does a longevity doctor cost?

Costs range from insurance-covered visits to cash-pay programs costing several thousand dollars per year. Basic annual programs may cost $1,500–$5,000, while comprehensive programs with advanced testing and ongoing care can cost $5,000–$25,000+.

Are longevity doctors covered by insurance?

Sometimes. Standard visits and medically necessary labs may be covered, but advanced testing, biological age tests, full-body imaging, coaching, supplements, and membership fees often are not. Coverage depends on the provider, diagnosis, billing model, and insurance plan.

Can I use HSA or FSA funds for a longevity doctor?

Possibly, but not always. Some medically necessary expenses may qualify, while general wellness services may not. IRS rules generally require expenses to relate to diagnosis, treatment, mitigation, cure, or prevention of disease. Check your plan before paying.

What is the difference between a longevity doctor and a functional medicine doctor?

Functional medicine is an approach that looks for upstream contributors to symptoms or disease. Longevity medicine is a goal: improving how you age. Many longevity doctors use functional medicine tools, but not all functional medicine doctors focus on aging or healthspan.

What is the difference between a longevity doctor and a concierge doctor?

Concierge medicine is a delivery model based on membership, access, and longer visits. Longevity medicine is a clinical focus on prevention and healthspan. A longevity doctor may run a concierge practice, but not all concierge doctors focus on longevity.

Do I need a longevity doctor or a longevity coach?

Choose a doctor for diagnosis, lab interpretation, prescriptions, hormones, imaging, or unexplained symptoms. Choose a coach for accountability, habits, and lifestyle implementation. Many people benefit from both.

What credentials should I look for in a longevity doctor?

Look for an active medical license, board certification in a primary specialty, relevant additional training, a transparent scope of practice, and clear explanations of what is evidence-based versus experimental.

What testing do longevity doctors typically order?

Common tests include blood panels, metabolic markers, lipids, glucose/insulin markers, hormone testing, inflammatory markers, and sometimes imaging or biological age tests. Testing should be personalized and tied to a clear decision.

Are full-body scans necessary?

Not for everyone. Full-body MRI or similar screening may help in selected high-risk situations, but broad screening in people without symptoms can lead to false positives, anxiety, and unnecessary follow-up. Ask what decision the scan will change.

Can I see a longevity doctor via telemedicine?

Yes, many longevity doctors offer remote consultations. Some labs, imaging, physical exams, or procedures may still require in-person visits or local facilities.

Is longevity medicine evidence-based?

Some parts are strongly evidence-based, especially preventive care, cardiometabolic risk reduction, exercise, nutrition, sleep, and chronic disease prevention. Other parts, such as biological age testing, peptides, and some advanced scans, are newer or more controversial.

Sources

About the Author

Brent Wallace , Longevity Clinic Growth Operator

Brent Wallace is the founder and CEO of LongevityClinicMarketing.com and built Spannr.com into one of the leading longevity clinic directories...

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