Longevity Medicine
What Is Biological Age?
Last reviewed: May 2026 · Haute MD Editorial Team
Biological age measures how old your body is at a cellular and molecular level — which may be significantly younger or older than your chronological age. People with the same chronological age can have biological ages differing by decades based on genetics, lifestyle, diet, sleep, stress, and environmental exposures. Measuring and reducing biological age is the central goal of longevity medicine.
How biological age is measured
DNA methylation clocks (epigenetic clocks) are currently the most validated biological age tests. They measure methylation patterns at specific genomic CpG sites that change predictably with aging and predict mortality and disease risk. Commercial tests include TruDiagnostic (TruAge), using GrimAge and DunedinPACE clocks.
Can biological age be reversed?
Research shows lifestyle interventions — consistent aerobic exercise, dietary optimization, quality sleep, stress reduction, and targeted supplementation — can measurably reduce epigenetic biological age. A 2021 study showed diet and lifestyle changes reduced biological age by an average of 3.23 years in 8 weeks.
Other biological age indicators
Telomere length, inflammatory markers, metabolic health markers, cardiac age (VO2 max, CAC), and brain age (cognitive testing, MRI volumetrics) all contribute to a comprehensive assessment.
Frequently Asked Questions
What is the best biological age test?
DNA methylation clocks, particularly GrimAge and DunedinPACE, have the strongest validation for predicting mortality and age-related disease. TruDiagnostic uses these validated clocks.
What is the difference between chronological age and biological age?
Chronological age is simply years lived. Biological age reflects cumulative cellular damage and repair — a far better predictor of health, function, and remaining lifespan.
Can I reduce my biological age?
Yes. Exercise, dietary improvements, better sleep, and stress reduction can meaningfully reduce epigenetic biological age. Longevity medicine implements and monitors these changes.
Is biological age testing accurate?
Epigenetic clocks are highly validated for predicting mortality at the population level. Individual test-to-test variation exists — tracking trends over time is more informative than a single measurement.
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Longevity Medicine · Miami Beach, FL
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Longevity Medicine · New York, NY
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Longevity Medicine · New York, NY
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