Age Calculator
Calculate your exact age from your date of birth. See your age in years, months, days, and total days lived — updated to today.
How to calculate Age
Your age is the elapsed time between your date of birth and today, calculated precisely in years, months, and days. This sounds simple, but the irregular lengths of months and the existence of leap years make exact calculation more involved than it appears.
The algorithm subtracts the birth day from today's day, birth month from today's month, and birth year from today's year, then borrows from the next higher unit when a component goes negative — exactly as you would when subtracting large numbers by hand.
Age calculators are used in medicine (paediatric dosing depends on exact age), law (legal age thresholds for contracts, voting, retirement), insurance (premiums change at specific ages), and genealogy research.
Interesting facts: the average human lives about 28,000 days. A person aged 40 has lived through roughly 10 or 11 leap years. The oldest verified human lifespan was 122 years and 164 days (Jeanne Calment, 1875–1997).
This calculator shows your age in years, months, days, and total days elapsed from your birth date to today's date.