Biological Age vs Chronological Age
Why It Matters
Your chronological age is simply how many years you’ve been alive. Your biological age, however, is a measure of how old your body actually functions at a cellular level. Two people who are both 50 years old may have completely different biological ages depending on their lifestyle, diet, stress levels, and genetic expression.
Studies show that a younger biological age is linked to a significantly lower risk of chronic diseases and early mortality (Cell, 2021). By tracking your biological age, you can determine whether you are accelerating, slowing, or reversing your aging process.
How To Measure It
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Epigenetic & Blood Biomarker Testing
The Blueprint Speed of Aging Test by Bryan Johnson measures how fast your body is aging biologically compared to your chronological age, using advanced epigenetic and blood biomarker analysis. It provides a personalized "rate of aging" score, helping you track the effectiveness of longevity interventions over time.
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Wearable Data Analysis - Whoop
WHOOP does not display a single “biological age” number to the user, but instead focuses on several physiological metrics that reflect your body’s recovery, stress, and fitness, which can indirectly indicate how “young” or “old” your body is functioning - namely: Heart Rate Variability, Resting Heart Rate, Respiratory Rate, Recovery Score, Sleep Score, and Cardiorespiratory Fitness (VO₂ Max) estimations.
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Wearable Data Analysis - Garmin
Garmin wearables offer a feature called “Fitness Age,” which is essentially an estimate of your biological or physiological age based on your fitness level. In the Garmin Connect app, you can see your Fitness Age alongside your actual age, and even get tips to lower it. This metric is calculated using a combination of your performance and health data, with VO₂ Max as the foundation, supplemented by other recovery, stress, fitness, and body composition metrics.
