Interactive · Evidence-first
Longevity Tools
Small, honest, free tools that do one thing well — no sign-up, no data leaving your browser, and the same evidence-first, no-hype read we bring to our graded rankings. Each one shows its working and tells you, plainly, what it can and can't do.
Biological Age Calculator (Levine PhenoAge)
Calculate your biological age from a standard blood panel using the Levine PhenoAge equation (Levine et al., 2018).
Open toolFitness Age & VO2max Estimator
Estimate your VO2max and a 'fitness age' from age, sex, waist, resting heart rate, and activity — using the inputs of the validated HUNT non-exercise model.
Open toolLongevity Test Cost Comparator
Compare biological-age and biomarker tests by price, test type and evidence, with educational guidance on what each result can and cannot tell you.
Open toolHow to read these
Every tool here is educational, not medical advice. They produce estimates and comparisons to help you ask better questions — not diagnoses, prescriptions, or buying recommendations. The math and the data are hard-coded and shown openly, but a population estimate is never a measurement, and a price table is never a substitute for a clinician. If you have relevant health conditions, talk to one before acting on anything you read here.
Looking for a guide or review? Explore the complete library.