Functional age is the only number that matters
Calendar age tells you when you were born. Functional age tells you how the body you actually live in is doing. The first is fixed. The second is not.
Living to 100
Longevity, functional age, and what it actually takes to build a long, capable life.
Most people think about longevity too late and too vaguely. I write about it the way I approach everything in healthcare: with specificity, measurement, and a willingness to say what the data actually shows — including when it contradicts conventional advice.
Writing on longevity
The 100ers philosophy
A short framework for living the back half well. Six commitments, one cadence, no shortcuts.