How it's calculated
age = reference date − birth date (split into years, months, days)
Counts full years, then the remaining months and days between birth date and the reference date, borrowing days from the previous month and months from the year as needed. Also derives total days, weeks and months lived.
Common questions
How is exact age calculated?
It counts full years, then the remaining months and days to the reference date, accounting for leap years and uneven month lengths.
Can I find my age on a future date?
Yes. Set the reference date ahead of today to see how old you'll be then.