🏋️ Fitness & Wellness Aug 28, 2025 · Brian St. Pierre, MS, RD

Biological age tests: Should you get one?

Precision Nutrition
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Biological age tests: Should you get one?
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If you’ve heard of billionaire Bryan Johnson, you’ve likely encountered the phrase “bio age testing.”
Johnson, the subject of the Netflix documentary Don’t Die, says he’s on a quest to achieve the lowest possible “biological age” (also known as bio age).
He reportedly spends millions each year on anti-aging treatments—dozens of daily supplements, weekly acid peels for his skin, injections to boost collagen production, hyperbaric oxygen therapy, and

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