Part 1
The Truth About Aging
Picture two women, both 78. One plays tennis twice a week, drives herself to see her grandchildren, and takes two pills a day. The other needs help getting out of a chair and takes fourteen. They were born the same year. They are not the same age. This part of the book is about the difference between them, and how much of it was decided by genes (less than you think) and how much by the forty years before (more than you think).
Clinical scenes in this edition are explicitly labeled illustrations. They describe imagined situations used to explain medical decisions, not documented patients, diagnoses, conversations, or treatment outcomes. They should not be read as evidence that a particular intervention works. Personal recollections are recollections, not medical records.
Evidence grade (draft mapping). 12 questions; a question with mixed evidence counts under each grade.
Figure from the book · Q2
- 1. What does “dying of old age” leave unexplained?Age alone rarely explains the full medical story. Identifying disease and frailty can reveal opportunities for care, although no program makes death avoidable.EEstablished clinical knowledge
- 2. What is the difference between lifespan and healthspan?Lifespan is how long you live. Healthspan is how long you live well. The gap between them is the real enemy.CObservational
- 3. Why do we age at all?Aging is damage that builds up faster than the body repairs it. Scientists now describe twelve specific kinds of damage, called the hallmarks of aging.EEstablished clinical knowledge
- 4. Is aging a disease?Officially, no. Practically, it is the single biggest risk factor for almost every disease you fear, so it makes sense to treat it as something we can slow.JClinical judgment / author synthesis
- 5. How much of my lifespan is genetic?Many estimates of lifespan heritability are a quarter or less, but that does not mean the remaining years are under personal control. Environment, social conditions, chance, behavior, and medical care all contribute.CObservational
- 6. What is the maximum human lifespan? Can I live to 120?The oldest verified person lived to 122. Living to 120 is not a realistic plan for anyone alive today. Living to 90 in good shape is.FNot demonstrated / insufficient
- 7. Is longevity science real, or is it marketing?Both. The laboratory science is real and exciting. Most of what is sold to consumers is far ahead of it.JClinical judgment / author synthesis
- 8. What have the mouse studies actually shown?A handful of drugs reliably extend mouse lifespan. Most supplements tested the same way failed.DPreclinical / mechanistic
- 9. If I could do only five things, what would they be?Do not smoke. Control your blood pressure. Build and keep muscle. Protect your sleep. Stay connected to people.ARobust human trials
- 10. What habits do you prescribe more often than any pill?Ten small ones. None costs much, and together they outperform most of what is sold as longevity medicine.BLimited or small human studies
- 11. I am already 70. Is it too late?No. The body responds to good inputs at every age, and some of the best results happen in the oldest people.ARobust human trials
- 12. I am 35. Isn’t this an old person’s problem?At 35 you have the one asset no one can buy later: time. Small changes now compound for fifty years.GGuideline-based / consensus