age difference
Age difference compares two birth dates against each other, without using today's date anywhere in the calculation. That is why this page's result never goes stale: the difference between two people born on fixed dates is always the same, year after year.
The result uses the same year-month-day breakdown as the rest of the calculator, so each unit can be checked separately, alongside the total number of elapsed days.
This is the edge case that confirms identical dates do not trigger an error or a phantom difference: everything comes back at zero, including the total day count.
Even with the older person entered second, the result correctly points to person 2 as the older one, because the comparison uses the dates themselves, not the order of the fields.
It compares the birth date with a reference date and returns the exact civil age in years, months and days. The same engine also powers days lived, next birthday, age difference and future target age calculations.
Yes. The result indicates whether person 1, person 2, or neither, when the dates match, is older, by comparing birth year, month and day regardless of the order the fields were filled in.
Yes. When both birth dates are identical, the result flags the comparison as a tie and shows a zero difference across years, months, days and the total day count, without triggering any validation error.
No. Unlike pages that use today's date as a reference, age difference only compares the two birth dates against each other, so the result stays the same today, a year from now, or a decade from now.
Person 1 is older
Difference of 5 years, 5 months and 14 days (1991 total days).
Dates and calculations stay only in your browser.