Snapshot · Huberman Lab
Research on subjective age shows that after 40 most people feel about 20% younger than their biological age, and that subjective age is a better predictor of longevity than biological age.
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At 1:16:30 · chapter starts 1:13:47
The question of how old you are gives way to the more powerful question of how old you feel. Castel introduces subjective age — a self-report that, after 40, reliably runs about 20% below chronological age — and reveals that it predicts longevity better than the number on a birth certificate. This is not mere positive thinking: those who hold a positive but friction-embracing view of their own aging (not blindly rosy, but open to what they can still control) outlive those with purely negative or purely optimistic outlooks. Age stereotypes, Castel cautions, can be internalised and become behavioural — told you're supposed to slow down at 70, many people do exactly that. His solution is practical: find living role models who have aged well, ideally people whose trajectory you can observe at close range (often a grandparent or parent), and let their example reshape your expectations of what's possible.
How old you feel — your subjective age — is a stronger predictor of how long you'll live than your chronological age. After 40, most people feel about 20% younger than their birth certificate says. Crucially, those who hold a positive but friction-accepting view of their own aging prospects outlive those who hold entirely rosy or entirely negative views.
How old you feel — your subjective age — is a more powerful predictor of how long you will live than your actual chronological age.
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