How does the age calculator work?

Enter your date of birth and an optional as-of date. The calculator returns your age in years, months, and days, plus totals.

Does it handle leap years correctly?

Yes. Calculations follow real calendar rules, including leap years and varying month lengths.

Yes. Change the as-of date to calculate age at any point in time.

Yes. The output can include totals like weeks, days, and other breakdowns depending on the calculator UI.

Calculate age in years, months, and days. Includes totals and a next birthday countdown.

Calculate your age on any date. Useful for forms, planning, and “how old was I then?”

Date of birth

As of date

Enter your date of birth to see results.