Age Difference Calculator
Compare two dates of birth and see the exact age gap — in years, months, days, and total days — with a visual timeline.
How to Calculate Age Difference
Type or select two dates of birth (or any two dates) using the date fields above.
The calculator finds the exact calendar difference between the two dates.
See the difference in years, months, and days — plus the total number of days.
Examples
Siblings
Person A: January 15, 1990
Person B: June 18, 1994
Difference: 4 years, 5 months, 3 days
Twins born on different days
Twin A: December 31, 2000
Twin B: January 1, 2001
Difference: 0 years, 0 months, 1 day
Couple
Partner A: March 8, 1985
Partner B: November 22, 1988
Difference: 3 years, 8 months, 14 days
Parent and child
Parent: April 5, 1970
Child: September 12, 2000
Difference: 30 years, 5 months, 7 days
Frequently Asked Questions
Does the order of dates matter?
No. The calculator always shows the absolute difference regardless of which date is first.
Is the calculation exact?
Yes. It uses real calendar math — accounting for different month lengths and leap years.
Can I compare any two dates, not just birthdays?
Yes. You can enter any two dates — for example, two project start dates or historical events.