Age Difference Calculator
Find the exact age gap between two people or two dates — in years, months and days. See who is older instantly.
How the age difference is calculated
The calculator subtracts the earlier date of birth from the later one, then breaks the gap down into full years, remaining full months and remaining days — accounting for varying month lengths and leap years.
Common uses for an age difference calculator
Quickly find the exact gap between siblings, a parent and child, or partners — useful for family records, photo albums and milestones.
Couples often want to know their precise age gap in years, months and days for marriage records, biodatas and matrimonial profiles.
Compare two people's ages against a cut-off, or check the gap between a candidate and a scheme's minimum or maximum age limit.
Frequently asked questions
How is the age difference between two people calculated?
The calculator identifies the earlier and later dates of birth, subtracts them, and then decomposes the gap into full years, remaining full months and remaining days using calendar-aware logic that respects month lengths and leap years.
Does the order of the two dates matter?
No. You can enter the dates in any order. The calculator always shows a positive difference and tells you which person is older, so swapping Person A and Person B gives the same gap.
Does it account for leap years?
Yes. The JavaScript Date object handles leap years automatically when computing month and day differences, so February 29 birthdays are handled correctly.
What do the total months, weeks and days mean?
These express the same age gap in different single units. Total Days is the raw number of days between the two dates, Total Weeks divides that by 7, and Total Months is the gap counted in whole calendar months.
What happens if both people share the same date of birth?
If both dates are identical, the difference is 0 years, 0 months and 0 days, and the calculator notes that both people are the same age.