To calculate chronological age manually, write the reference date and the birth date in Year-Month-Day format, then subtract right to left: days first, then months, then years. If a number is too small to subtract, borrow from the next larger unit — the exact rule is where most people get it wrong. Done correctly, you…
Chronological age is the number of years you’ve been alive, counted from your birth date. Biological age is how old your body actually functions, based on cellular health, organ function, and biomarkers like DNA methylation. The two numbers can match, or they can be years apart. A 50-year-old with a healthy lifestyle can have the…
Ask someone how old they are, and they’ll give you a number. That number is chronological age — the most basic, most misunderstood measurement of time you’ll ever use. It shows up on your driver’s license, your birth certificate, your insurance form, and your kid’s school enrollment paperwork. Run the numbers yourself with our Chronological Age…
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