Phenotypic Age Calculator

A Normal Curves–style demo calculator based on the Levine phenotypic age formula. Enter your age and the 9 blood measures, or leave blanks and let the page fill in fun placeholder defaults so people can still get a number.

Inputs

This version accepts common U.S. lab units and converts them behind the scenes into the units used in the published formula. Blank fields can be filled with placeholder defaults.

Chronological age

Years

Albumin

Formula expects g/L

Creatinine

Formula expects µmol/L

Glucose

Formula expects mmol/L

C-reactive protein (CRP)

Formula uses ln(CRP) with CRP in mg/dL

Lymphocyte percent

Percent

Mean cell volume (MCV)

Red cell distribution width (RDW)

Percent

Alkaline phosphatase

U/L

White blood cell count

Formula expects 1000 cells/µL; these are numerically equivalent

Default age: 45

Albumin: 4.3 g/dL

Creatinine: 0.9 mg/dL

Glucose: 90 mg/dL

CRP: 1.5 mg/L

Lymphocytes: 30%

MCV: 90 fL

RDW: 13%

ALP: 70 U/L

WBC: 6.0 K/µL

These defaults are just friendly placeholder values for demo purposes, not official NHANES means and not a medical recommendation.

Results

Estimated phenotypic age

38.6 years

6.4 years younger than chronological age.

10-year mortality score used inside the formula

1.7%

Difference from chronological age

-6.4 years

Notes: this calculator uses the published phenotypic age coefficients, the Gompertz mortality step, and the age conversion equation from the Levine supplementary methods. It is best treated as an educational curiosity.

For real use, people should enter actual lab values and avoid over-interpreting a single score.