The Lexicon: The Living Library of Longevity Medicine
Longevity medicine is moving faster than anyone can build standards for it. The vocabulary has not kept up. The Lexicon is our answer: a living library of the field with a standardized definition for each concept, the publications behind it, a map of how every concept connects, and what physicians in our network actually do with it in practice.
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Dr. David Luu, Founder, longevitydocs™Last updated September 3, 2026 · 7 min read
The Lexicon opens on the graph. Search a concept, or read the field as a map.
Longevity medicine is moving faster than anyone can build standards for it. That is mostly good. More people care about their health, physicians are moving into prevention, researchers are studying aging, and more companies are shipping products.
The vocabulary has not kept up. The same term means three things depending on who is using it, and patients arrive with definitions they got from a social media post.
We need words everyone agrees on.
Dr. David Luu, MD · Founder, longevitydocs™
The Lexicon is our answer. A standardized definition for each concept, with the publications behind it, so you can check the evidence without a PhD and without fact-checking an influencer.
Every concept sits in a map of the concepts around it. Underneath each one sits a layer of community knowledge, drawn from what physicians in the longevitydocs™ network do with that concept in clinic. Hundreds of topics are live in the beta now, and the library grows every week.
That is what a living library has to do for a field this young. longevitydocs™ exists to build the trusted global infrastructure that makes longevity medicine the standard of care, and infrastructure starts with language. Protocols travel between clinics only when the terms inside them hold their meaning. Research reaches the bedside only when a physician can trace a claim to its source in under a minute. Patients get better care when the definition their doctor uses matches the one they read at home. Every doctor should be a longevity doctor, and no doctor can practise a discipline whose words have yet to be agreed.
Why does longevity medicine need a standardized vocabulary?
Consider what a single word has to survive today. A patient reads it in a caption. A supplement brand prints it on a label. A journalist uses it to headline a mouse study. A physician writes it in a chart. Four meanings, one term, and only one of those four carries a citation. We set out the wider version of this problem in What People Get Wrong About Longevity Medicine.
Shared definitions are how disciplines become disciplines. Cardiology agreed on what an ejection fraction measures before it could agree on how to treat one. Longevity medicine reaches that threshold the same way: words everyone agrees on, with the evidence attached to each one.
How does the longevitydocs Lexicon work?
1. Pick a concept and learn it with references
Take DEXA Scan. Definition, how it works, how it is measured, what the levels mean, with a T-score table and a citation on every claim. Key takeaways at the bottom if you need it in thirty seconds.
Every claim carries its citation. Blue terms open the concept they name.
2. Explore connected concepts
Every concept sits in a map. DEXA connects to bone density, muscle mass, sarcopenia, visceral fat, osteoporosis. Follow the links or open the graph and see the whole field at once.
Connected concepts for DEXA Scan. Dashed nodes sit on the frontier list, referenced and awaiting authorship.
3. See what the longevitydocs community says about it
This is the part no textbook has. Under Community knowledge, you get what physicians in our network actually do with the concept in practice.
Community knowledge on the DEXA Scan entry, attributed to named physicians and lettered back to the session it came from.
A Mastermind faculty debate on whether an AI read of a plain spine image can substitute for DEXA, and why FDA approval says no. A Hormones Mastermind participant asking why we wait until 65 to scan bone, by which point the damage is done.
Members can jump straight to the timestamp and watch it.
The Mastermind clip behind the diagnostic validity note, open at the timestamp. Members watch the exchange in full.
Who is the Lexicon for?
Everyone, at three different depths.
Anyone reading. The definitions and references are free.
Physicians building a clinic. Explore the Lexicon to standardize how your team uses clinical language.
Physician members of longevitydocs™. The community layer, the sessions, the timestamps, the full recordings.
One definition serves all three, which is the point. A physician can send a patient to an entry and know exactly what they will find there.
How do I use the Lexicon in my clinic?
If you are building a clinic, explore the Lexicon to standardize how your team uses clinical language.
Start with the terms that appear in your intake forms and your patient education material. Agree on one definition for each, pulled from the same entry, so the meaning holds constant from the front desk to the consultation room to the follow-up email. Then work outward through the graph into the adjacent concepts your protocols depend on.
For physicians who want the layer underneath, the Community knowledge sections carry the faculty discussion and the session recordings where these calls get argued out in full. Physicians formalising the shift read How Longevity Medicine Certification Propels Your Practice: The ROI.
How do I get access to the Lexicon?
The Lexicon is in beta, and open to everyone. The definitions and references are free. Anyone can read them. No application, no login, no waitlist.
The community layer, the sessions, the timestamps, the full recordings, is for physicians members of longevitydocs™. Physicians already in the network have it. Physicians who want it can join.
Some concepts are already written. Others are referenced constantly and not yet covered. Those are on the frontier list, and they get written next.
The Lexicon is our answer. A standardized definition for each concept, with the publications behind it, so you can check the evidence without a PhD and without fact-checking an influencer.
Every concept sits in a map of the concepts around it. Underneath each one sits a layer of community knowledge, drawn from what physicians in the longevitydocs™ network do with that concept in clinic. The Lexicon is in beta, hundreds of topics are live, and the library grows every week.
Why does longevity medicine need a standardized vocabulary?
Longevity medicine is moving faster than anyone can build standards for it. More people care about their health, more physicians are moving into prevention, more researchers are studying aging, and more companies are shipping products. The vocabulary has not kept up. The same term means three things depending on who is using it, and patients arrive with definitions they got from a social media post. We need words everyone agrees on.
How does the Lexicon work?
Three steps. Pick a concept and learn it with references: take DEXA Scan, with definition, how it works, how it is measured, what the levels mean, a T-score table and a citation on every claim, plus key takeaways at the bottom if you need it in thirty seconds. Explore connected concepts: DEXA connects to bone density, muscle mass, sarcopenia, visceral fat and osteoporosis, so you follow the links or open the graph and see the whole field at once. Then see what the community says about it under Community knowledge.
What is the Community knowledge layer?
Community knowledge is the part no textbook has. It carries what physicians in our network actually do with a concept in practice. A Mastermind faculty debate on whether an AI read of a plain spine image can substitute for DEXA, and why FDA approval says no. A Hormones Mastermind participant asking why we wait until 65 to scan bone, by which point the damage is done. Members can jump straight to the timestamp and watch it.
Who can access the Lexicon, and is it free?
The Lexicon is in beta. The definitions and references are free. Anyone can read them. The community layer, the sessions, the timestamps, the full recordings, is for physicians members of longevitydocs™. Membership is open to licensed MD, DO and MBBS holders by application.
How do I use the Lexicon in my clinic?
If you are building a clinic, explore the Lexicon to standardize how your team uses clinical language. Agree on one definition per concept across intake forms, patient education and internal protocols, so the meaning of a term stays constant from the front desk to the consultation room.
What is longevitydocs™?
longevitydocs™ is the world's leading vetted physician network in longevity medicine, offering physician-only access to evidence, peers, and practical growth. Over 1,000 doctors across 68+ countries, from institutions including Cleveland Clinic, Mayo Clinic, Kaiser Permanente, Mount Sinai and Atria, united by a single conviction: every doctor should be a longevity doctor. The network runs the Lexicon, the Certified longevitydocs™ (CLD) credential, the Masterminds and the annual Summit.
How do I apply for longevitydocs™ membership?
Apply on the membership page. Membership is open to licensed MD, DO and MBBS holders, and every application is reviewed manually to confirm credentials. Approved physicians get the community channels and app, a listing in the Global Directory, peer access across 68+ countries, and the Community knowledge layer inside the Lexicon.
How do physicians contribute to the Lexicon?
Physician members shape the Lexicon in three ways. They supply the community knowledge layer: what physicians say in Mastermind sessions, faculty debates and clinical discussions is captured and attached to the relevant concept, timestamped so other members can watch the exchange in full. They direct the roadmap through the frontier list, which holds the concepts referenced constantly and not yet covered, and those get written next. And they keep entries accurate by flagging where published evidence has moved or where practice diverges from what the literature reports. Reading the Lexicon takes nothing. Writing into it runs through membership, open to licensed MD, DO and MBBS holders.
About Dr. David Luu, MD.™Dr. David Luu, MD, is the Founder of longevitydocs™. He is a trained pediatric cardiac surgeon, longevity tech entrepreneur, and philanthropist who helps physicians, organizations, and leaders build the global infrastructure of longevity medicine.About longevitydocs™longevitydocs.™ is the world's leading longevity physician community. Over 1,000 doctors across 68+ countries united by a single conviction: every doctor should be a longevity doctor. We are building the infrastructure, education, and community physicians need to make longevity medicine their default practice.
Editorial Disclaimer
This article is published for licensed physicians and qualified healthcare professionals.
All content is for continuing medical education and professional information purposes only. It reflects emerging research, science, and technology that may have implications for the practice of medicine. It does not constitute medical advice, clinical recommendations, or treatment guidance for any individual patient.
By reading this article, you confirm that you are a licensed healthcare professional and that you will apply the information contained herein within the bounds of your clinical judgment, professional obligations, and applicable regulations.
If you are a patient or consumer reading this article, please consult your personal physician or a qualified healthcare provider for guidance specific to your situation.
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The Lexicon: The Living Library of Longevity Medicine
EDUCATION
The Lexicon: The Living Library of Longevity Medicine
Longevity medicine is moving faster than anyone can build standards for it. The vocabulary has not kept up. The Lexicon is our answer: a living library of the field with a standardized definition for each concept, the publications behind it, a map of how every concept connects, and what physicians in our network actually do with it in practice.
Longevity medicine is moving faster than anyone can build standards for it. That is mostly good. More people care about their health, physicians are moving into prevention, researchers are studying aging, and more companies are shipping products.
The vocabulary has not kept up. The same term means three things depending on who is using it, and patients arrive with definitions they got from a social media post.
We need words everyone agrees on.
Dr. David Luu, MD · Founder, longevitydocs™The Lexicon is our answer. A standardized definition for each concept, with the publications behind it, so you can check the evidence without a PhD and without fact-checking an influencer.
Every concept sits in a map of the concepts around it. Underneath each one sits a layer of community knowledge, drawn from what physicians in the longevitydocs™ network do with that concept in clinic. Hundreds of topics are live in the beta now, and the library grows every week.
That is what a living library has to do for a field this young. longevitydocs™ exists to build the trusted global infrastructure that makes longevity medicine the standard of care, and infrastructure starts with language. Protocols travel between clinics only when the terms inside them hold their meaning. Research reaches the bedside only when a physician can trace a claim to its source in under a minute. Patients get better care when the definition their doctor uses matches the one they read at home. Every doctor should be a longevity doctor, and no doctor can practise a discipline whose words have yet to be agreed.
Why does longevity medicine need a standardized vocabulary?
Consider what a single word has to survive today. A patient reads it in a caption. A supplement brand prints it on a label. A journalist uses it to headline a mouse study. A physician writes it in a chart. Four meanings, one term, and only one of those four carries a citation. We set out the wider version of this problem in What People Get Wrong About Longevity Medicine.
Shared definitions are how disciplines become disciplines. Cardiology agreed on what an ejection fraction measures before it could agree on how to treat one. Longevity medicine reaches that threshold the same way: words everyone agrees on, with the evidence attached to each one.
How does the longevitydocs Lexicon work?
1. Pick a concept and learn it with references
Take DEXA Scan. Definition, how it works, how it is measured, what the levels mean, with a T-score table and a citation on every claim. Key takeaways at the bottom if you need it in thirty seconds.
2. Explore connected concepts
Every concept sits in a map. DEXA connects to bone density, muscle mass, sarcopenia, visceral fat, osteoporosis. Follow the links or open the graph and see the whole field at once.
3. See what the longevitydocs community says about it
This is the part no textbook has. Under Community knowledge, you get what physicians in our network actually do with the concept in practice.
A Mastermind faculty debate on whether an AI read of a plain spine image can substitute for DEXA, and why FDA approval says no. A Hormones Mastermind participant asking why we wait until 65 to scan bone, by which point the damage is done.
Members can jump straight to the timestamp and watch it.
Who is the Lexicon for?
Everyone, at three different depths.
Anyone reading. The definitions and references are free.
Physicians building a clinic. Explore the Lexicon to standardize how your team uses clinical language.
Physician members of longevitydocs™. The community layer, the sessions, the timestamps, the full recordings.
One definition serves all three, which is the point. A physician can send a patient to an entry and know exactly what they will find there.
How do I use the Lexicon in my clinic?
If you are building a clinic, explore the Lexicon to standardize how your team uses clinical language.
Start with the terms that appear in your intake forms and your patient education material. Agree on one definition for each, pulled from the same entry, so the meaning holds constant from the front desk to the consultation room to the follow-up email. Then work outward through the graph into the adjacent concepts your protocols depend on.
For physicians who want the layer underneath, the Community knowledge sections carry the faculty discussion and the session recordings where these calls get argued out in full. Physicians formalising the shift read How Longevity Medicine Certification Propels Your Practice: The ROI.
How do I get access to the Lexicon?
The Lexicon is in beta, and open to everyone. The definitions and references are free. Anyone can read them. No application, no login, no waitlist.
The community layer, the sessions, the timestamps, the full recordings, is for physicians members of longevitydocs™. Physicians already in the network have it. Physicians who want it can join.
Some concepts are already written. Others are referenced constantly and not yet covered. Those are on the frontier list, and they get written next.
Read more on the Lexicon page, or go straight in.
Frequently Asked Questions About the Lexicon
What is the Longevity Medicine Lexicon?
The Lexicon is our answer. A standardized definition for each concept, with the publications behind it, so you can check the evidence without a PhD and without fact-checking an influencer.
Every concept sits in a map of the concepts around it. Underneath each one sits a layer of community knowledge, drawn from what physicians in the longevitydocs™ network do with that concept in clinic. The Lexicon is in beta, hundreds of topics are live, and the library grows every week.
Why does longevity medicine need a standardized vocabulary?
Longevity medicine is moving faster than anyone can build standards for it. More people care about their health, more physicians are moving into prevention, more researchers are studying aging, and more companies are shipping products. The vocabulary has not kept up. The same term means three things depending on who is using it, and patients arrive with definitions they got from a social media post. We need words everyone agrees on.
How does the Lexicon work?
Three steps. Pick a concept and learn it with references: take DEXA Scan, with definition, how it works, how it is measured, what the levels mean, a T-score table and a citation on every claim, plus key takeaways at the bottom if you need it in thirty seconds. Explore connected concepts: DEXA connects to bone density, muscle mass, sarcopenia, visceral fat and osteoporosis, so you follow the links or open the graph and see the whole field at once. Then see what the community says about it under Community knowledge.
What is the Community knowledge layer?
Community knowledge is the part no textbook has. It carries what physicians in our network actually do with a concept in practice. A Mastermind faculty debate on whether an AI read of a plain spine image can substitute for DEXA, and why FDA approval says no. A Hormones Mastermind participant asking why we wait until 65 to scan bone, by which point the damage is done. Members can jump straight to the timestamp and watch it.
Who can access the Lexicon, and is it free?
The Lexicon is in beta. The definitions and references are free. Anyone can read them. The community layer, the sessions, the timestamps, the full recordings, is for physicians members of longevitydocs™. Membership is open to licensed MD, DO and MBBS holders by application.
How do I use the Lexicon in my clinic?
If you are building a clinic, explore the Lexicon to standardize how your team uses clinical language. Agree on one definition per concept across intake forms, patient education and internal protocols, so the meaning of a term stays constant from the front desk to the consultation room.
What is longevitydocs™?
longevitydocs™ is the world's leading vetted physician network in longevity medicine, offering physician-only access to evidence, peers, and practical growth. Over 1,000 doctors across 68+ countries, from institutions including Cleveland Clinic, Mayo Clinic, Kaiser Permanente, Mount Sinai and Atria, united by a single conviction: every doctor should be a longevity doctor. The network runs the Lexicon, the Certified longevitydocs™ (CLD) credential, the Masterminds and the annual Summit.
How do I apply for longevitydocs™ membership?
Apply on the membership page. Membership is open to licensed MD, DO and MBBS holders, and every application is reviewed manually to confirm credentials. Approved physicians get the community channels and app, a listing in the Global Directory, peer access across 68+ countries, and the Community knowledge layer inside the Lexicon.
How do physicians contribute to the Lexicon?
Physician members shape the Lexicon in three ways. They supply the community knowledge layer: what physicians say in Mastermind sessions, faculty debates and clinical discussions is captured and attached to the relevant concept, timestamped so other members can watch the exchange in full. They direct the roadmap through the frontier list, which holds the concepts referenced constantly and not yet covered, and those get written next. And they keep entries accurate by flagging where published evidence has moved or where practice diverges from what the literature reports. Reading the Lexicon takes nothing. Writing into it runs through membership, open to licensed MD, DO and MBBS holders.
Keep reading
What People Get Wrong About Longevity Medicine
Ten things physicians and patients get wrong, and why translation is the bottleneck.
How Longevity Medicine Certification Propels Your Practice: The ROI
What the credential changes in referrals, positioning and revenue.
The First Certified longevitydoc: Dr. Naana Boakye, MD, CLD, MPH
One physician's route through the certification, in her own words.
This article is published for licensed physicians and qualified healthcare professionals.
All content is for continuing medical education and professional information purposes only. It reflects emerging research, science, and technology that may have implications for the practice of medicine. It does not constitute medical advice, clinical recommendations, or treatment guidance for any individual patient.
By reading this article, you confirm that you are a licensed healthcare professional and that you will apply the information contained herein within the bounds of your clinical judgment, professional obligations, and applicable regulations.
If you are a patient or consumer reading this article, please consult your personal physician or a qualified healthcare provider for guidance specific to your situation.