Biological Age Calculator: How Old Is Your Body Really?

Your biological age is an estimate of how old your body actually is on the inside — which can be very different from the number of birthdays you have had. This free biological age calculator gives you two ways to find out. The Quick mode takes about 60 seconds and uses only your everyday habits, while the Precise mode uses nine standard blood markers and the peer-reviewed Levine PhenoAge method for a clinical-grade estimate. Curious where you stand? Run the numbers below, then see how comprehensive longevity testing can turn an estimate into a plan.

How to Use the Biological Age Calculator

Choose the mode that fits what you have on hand. In Quick estimate mode, enter your age and answer nine short questions about exercise, sleep, nicotine, alcohol, diet, body composition, stress, social connection, and resting heart rate — the tool returns a lifestyle-based biological age in seconds, with a breakdown of which habits are helping and which are adding years. In Precise mode, enter nine standard lab values from a recent blood panel and the calculator applies the clinical PhenoAge formula for a more rigorous result, then highlights the markers with the most room to improve.

What Is Biological Age?

Chronological age simply counts the years since you were born. Biological age tries to capture how much your cells, organs, and systems have actually aged, which is shaped by genetics, lifestyle, and environment (the science of healthy aging is evolving quickly). Two people who are both 50 can have very different biological ages: one may have the cardiovascular and metabolic profile of a 40-year-old, while the other tracks closer to 60. Because biological age reflects modifiable factors, it can move in either direction over time — making it a useful, motivating metric to track.

The Science: PhenoAge and Your Bloodwork

The Precise mode is built on PhenoAge, a biological-age measure introduced by Dr. Morgan Levine and colleagues in 2018. It combines your chronological age with nine routine biomarkers — albumin, creatinine, fasting glucose, C-reactive protein, lymphocyte percentage, mean cell volume, red cell distribution width, alkaline phosphatase, and white blood cell count — through a statistical mortality model to produce a single age in years. You can pull every one of these values from a standard CBC and metabolic panel with an added hs-CRP, the same labs included in a typical longevity blood panel.

How to Lower Your Biological Age

The factors that most consistently shift biological age are the everyday ones: regular movement and strength training, consistent quality sleep, avoiding nicotine, moderate or no alcohol, a whole-food diet, a healthy body composition, managed stress, and strong social connection. Bloodwork adds another layer by surfacing specific markers — like inflammation (hs-CRP) or glucose — that you can target directly. The most effective approach pairs lifestyle changes with periodic testing so you can see whether your number is actually moving and adjust accordingly.

Frequently Asked Questions

For educational and wellness purposes only. This calculator provides estimates from published models and lifestyle research and does not diagnose, treat, or predict any disease or individual outcome. It is not a substitute for medical evaluation. These statements have not been evaluated by the FDA. Consult your healthcare provider before beginning any new wellness protocol.