DATE & TIME TOOL
Age Calculator
Find exact age in years, months, and days from any birth date.
Defaults to today. Change it to calculate age as of another date.
Age
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About this tool
Enter a birth date to see the exact age in years, months, and days. By default the age is calculated as of today, but you can set a different reference date — useful for figuring out how old someone was, or will be, on a specific day.
The calculation correctly accounts for leap years and for months of different lengths, so results stay accurate for any date range.
Frequently asked questions
- What if the reference date is before the birth date?
- The tool shows a validation message instead of a negative age — pick a reference date on or after the birth date.
- Does it handle leap years?
- Yes. Age is calculated using calendar-aware date arithmetic, so February 29th birthdays are handled correctly.
- What timezone is used?
- Dates are treated as calendar dates (no time-of-day component), so the result doesn't depend on your timezone.