Age is just a number—and one you may be able to change. At least that’s the pitch behind Tally Health, a new startup that’s among a crop of companies selling tests that offer to tell consumers their “biological age.”
You’ve heard of at-home tests like those from 23andMe and Ancestry, which scan your DNA to provide information about ethnic heritage and health risks. Now, a wave of startups is marketing tests that claim to parse your blood, urine, or a cheek swab to reveal your biological age. The tests measure epigenetic patterns, or changes in the body that affect how genes behave. Unlike a calendar
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