Age Calculator
Enter a birth date and an optional reference date to calculate age in completed years, months, and days.
Frequently asked questions
- How is the age calculated?
- Age is counted in completed years, months, and days between two calendar dates. No time of day or timezone is considered.
- How are leap-year birthdays handled?
- If you were born on February 29, the next birthday is treated as February 28 in non-leap years. The same rule applies to month-end dates.
- Can I calculate age on a past date?
- Yes. Change the reference date to any date on or after the birth date.