Age Difference Calculator

Enter two dates of birth to see who is older, the exact years/months/days difference, total days apart, and the gap in completed months.

Person A date of birth

Person B date of birth

—Exact age gap

—Total days apart

—Completed months apart

—Older date

—Calendar difference uses date-only Gregorian arithmetic.

Compare two birth dates

Enter both dates. The calculator orders them chronologically and reports the exact calendar gap plus total days and completed months apart.

What the result means

The years/months/days result is a calendar decomposition rather than a decimal-year estimate. It uses the same Gregorian month-length and leap-year rules as the Age Calculator.