Chapter 01 · The idea
Biological age versus the candles on the cake
Chronological age is how long you have been alive. Biological age is an attempt to estimate how your body is aging, which can run faster or slower than the calendar. This tool uses phenotypic age, a method published by Levine and colleagues in 2018 that combines nine routine blood markers with your chronological age into a single estimate.1 It was built from large population data and is widely used in aging research.
*Protocol plan, one draw a year. Charged at checkout. Renews each year.
The markers span several systems: albumin and C-reactive protein relate to inflammation and liver function, creatinine to the kidneys, glucose to metabolism, and the blood-count measures (white cells, lymphocyte percent, mean cell volume, red cell distribution width) to immune and red-cell health. Alkaline phosphatase reflects liver and bone activity. A pattern that looks older or younger than your years nudges the estimate up or down.
Chapter 02 · The fine print
What this number is not
This is a research-based estimate, not a diagnosis and not a prediction of how long you will live. Lab values shift day to day with hydration, illness, recent exercise, and time of day, so a single draw is a snapshot. The method was developed in specific populations and may fit you less well. Most importantly, no calculator replaces a clinician, who interprets your labs alongside your history and decides what, if anything, they mean for your care. Individual results vary.
A single result is a snapshot
How often should we draw?
One panel, repeated. More draws means you see change instead of a single snapshot. Tap an answer to start your Lab Pass.
Use the estimate as a prompt for a conversation, not a verdict. If a marker is outside its usual range, that is a reason to ask a clinician about it, not a reason to worry on your own. Individual results vary.
