Biological Age Calculator
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Biological age estimates how old your body seems from the inside. PhenoAge (Levine et al., 2018) combines your age with nine routine blood tests, such as albumin, glucose, CRP and white blood cell count, into an age in years.
| Phenotypic age | 42.54 |
| Chronological age | 50 |
| Difference | −7.46 years |
| Estimated 10-year mortality score | 2.38% |
Show steps
- Convert units: albumin 4.4 g/dL = 44 g/L; creatinine 0.9 mg/dL = 79.56 µmol/L; glucose 92 mg/dL = 5.107 mmol/L; CRP 1.2 mg/L = 0.12 mg/dL.
- Linear score (Levine et al., 2018): xb = −9.0098.
- 10-year mortality score: M = 2.381%.
- PhenoAge = 141.50225 + ln(−0.00553 × ln(1 − M)) ÷ 0.090165 = 42.54.
How to use it
- Find the nine values on a standard blood panel (CMP, CBC with differential and hs-CRP).
- Enter them in the units shown (U.S. lab units); the calculator converts to the units of the formula.
- Press Calculate to see your phenotypic age and how it compares with your actual age.
The PhenoAge formula
A linear score xb combines the markers with weights estimated from U.S. NHANES data. It is turned into a 10-year mortality risk M = 1 − exp(−e^xb (e^(120γ) − 1)/γ), and then into an age: PhenoAge = 141.50 + ln(−0.00553 ln(1 − M))/0.090165.
Reading the result
A PhenoAge below your actual age suggests your markers look like those of a younger average person. Markers such as CRP and glucose can change with a recent infection or a meal, so one result is a snapshot.
Biological Age Calculator quiz: 10 questions
Test yourself with 10 multiple-choice questions. Choose an answer and press Submit to see if you are right and why. Your score appears at the end.
Quiz complete
Frequently asked questions
Can I find my biological age without a blood test?
Questionnaire “body age” tools exist, but they are not validated. PhenoAge uses lab data and was tested against mortality in a large population.
Is PhenoAge the same as an epigenetic clock?
No. Epigenetic clocks use DNA methylation; PhenoAge uses routine blood chemistry.
Why do I need CRP?
Inflammation is one of the strongest signals of aging in the formula. Use a high-sensitivity CRP if possible.
Can I lower my biological age?
Markers like glucose, CRP and albumin respond to health and habits; discuss changes with your doctor.
Which units are used?
U.S. units on screen; the calculator converts albumin, creatinine, glucose and CRP to the formula's units.
Sources
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