Bryan Johnson· Author
how do we measure age well there's your chronological age which is when you were born and there's your biological age which you can look at throughout your entire body
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
how do we measure age well there's your chronological age which is when you were born and there's your biological age which you can look at throughout your entire body
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
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scientists calculate only ~20% of biological aging is genetically determined.
Your biological age is malleable but the number you get can depend on the technology.
Guess which one you can change easily
Science has shown us that the way people age is very different starting an early life before any diseases are present. For example, in a population of about 1,000 people who had their physiology study from birth until the age of 38, the data showed that they aged at very different rates. In other words, people with the same chronological age may have a vastly different biological age because of combined genetic and lifestyle factors. Some people may have a younger chronological age, but an older biological age and vice versa.