Age Difference Calculator
Drop in two birth dates and get the age gap down to the day — no counting on your fingers to settle who's older by how much.
How it works
The calculator figures out which date comes first, then walks forward from the older birthday to the younger one, tallying completed years, then months, then leftover days.
Day counts borrow from the real length of each month, so a gap ending on the 2nd doesn't pretend February had 31 days. That keeps the breakdown honest across the whole calendar.
It also shows the raw total in days, which is the number you'd want if you're comparing gaps or plugging the figure into something else.
Frequently asked questions
How is the age difference worked out?
It starts from the earlier birth date and counts full years, then months, then the remaining days up to the later birth date. The result is the completed gap, not a rounded guess.
Does the order of the two dates matter?
Put them in either order. The calculator sorts them for you and always reports the gap as a positive span, so you can't get a negative age difference.
What if both people share a birthday?
When the two dates land on the same day, the gap is zero and you'll see a note that they were born the same day.
Why show total days as well?
The years-months-days view reads naturally, but a single total-days figure is easier to compare or reuse. Both describe the same span, just at different resolutions.