Age Difference Calculator
Enter two dates of birth to find the exact age gap.
Years
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Months
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Days
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Total days apart
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Who is older
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How it works
- Enter the first person's date of birth.
- Enter the second person's date of birth.
- See the exact gap in years, months and days, and who is older.
Frequently asked questions
How is the age difference calculated?
The calculator counts complete years and months between the two birth dates, then the remaining days — the same way you would count on a calendar.
Does the order of the dates matter?
No. Enter the dates in any order; the calculator works out who is older and shows the gap.
Are leap years included?
Yes. Leap days are counted when working out total days between the two dates.
Is anything saved?
No. Dates stay in your browser and are not sent to our servers.
Find the exact age gap
Curious how much older a sibling, partner or friend is? Enter both birth dates to see the gap in years, months and days, plus the total number of days between the birthdays.
Also handy for
Checking eligibility rules that depend on relative ages, family history research, and settling friendly debates.