How to Use the Age Calculator
Enter a birth date, and the calculator instantly shows the exact age as of today in years, months, and days. Changing the reference date away from today calculates exact age as of any other past or future date instead.
The Age Calculator handles the subtract-and-borrow date math automatically — here's what each part of it does.
Entering a birth date
Enter the birth date using the date picker or by typing it directly. The result updates instantly, showing age broken down into years, months, and days rather than a single combined number, so both the "how old" and the finer detail are visible at once.
Calculating age as of a different date
By default, the calculator uses today as the reference point, but changing the reference date calculates exact age as of any other date instead — useful for the eligibility and cutoff-date scenarios covered elsewhere in this guide series.