Compare two dates of birth to find who is older and the exact age gap in years, months and days, plus the total number of days apart.
Enter your dates and select “Compare age difference” to see the result.
The age gap between two people is determined from their birth dates. The calculator orders the two dates, then measures the calendar interval from the earlier birth date to the later one.
The exact gap is decomposed into full calendar years, full months and remaining days. A second calculation counts the total elapsed days between the two birth dates.
Age difference = later birth date − earlier birth dateThis avoids subtracting rounded whole-year ages, which can look misleading around birthdays.
Person 1: 15 January 1990
Person 2: 20 October 1993
15 Jan 1990 → 15 Jan 1993 = 3 years
15 Jan 1993 → 15 Oct 1993 = 9 months
15 Oct 1993 → 20 Oct 1993 = 5 days
Age gap = 3 years, 9 months, 5 days = 1,374 total days.
Person 1 is older because Person 1 has the earlier birth date.
Enter two birth dates. The age difference calculator measures the calendar interval from the earlier birth date to the later one, and also shows the total difference in days.
The elapsed-day gap between two birth dates stays the same. Subtracting two rounded ages in whole years can give a different-looking answer around birthdays, so this calculator compares the actual birth dates.
Yes. The result includes the total number of days between the two birth dates. Use the age in days calculator to compare how many days each person has lived on the same chosen date.
The calculation uses actual calendar dates. Full years are counted first, then months and remaining days; when the original day is absent in a month, its last day is used. Total days include February 29 where applicable.
No. Subtracting birth years ignores the month and day. For example, two people born in 1990 and 1993 are not automatically exactly three years apart; the exact gap depends on both full birth dates.
Yes. If both people have the same date of birth, the age difference is zero years, zero months and zero days.