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How Fast Are You Aging? Neuroscience Says These 3 Simple Tests Can Tell You

5 min readJul 18, 2025

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You know your chronological age. But do you know your biological age? For the former, you just count the number of candles on your birthday cake. But for the latter, a newly trendy measure of how fast you’re physically aging, you generally need more complicated tests.

The expensive way to test your biological age

For instance, Bryan Johnson, the tech entrepreneur turned antiaging guru who has been at the forefront of popularizing the concept, is 47 years old. But he claims that, thanks to his rigorous health routine, his biological age is at least five years younger.

How does he know? According to Men’s Health, he uses a test called “TruDiagnostic, which uses an epigenetic clock called DunedinPACE, developed by researchers at Columbia and Duke.” You can buy it online for $500. Other researchers and antiaging aficionados use other equally complex and expensive methods.

All of them are likely to be out of reach for those who are less rich and less obsessed than Johnson. But most of us would probably like to have some idea of how well we’re doing at maintaining our health. Is there a quick and dirty option that can give you an approximate sense of how well you’re aging?

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Jessica Stillman
Jessica Stillman

Written by Jessica Stillman

Top Inc.com columnist/ Editor/ Ghostwriter. Book lover. Travel fiend. Nap enthusiast. https://jessicastillman.com/