Age Difference Calculator
Calculate the exact age difference between two people in years, months, and days from their birth dates.
Birth dates
Age difference
Person 1 is 5 years older than Person 2
Exact gap: 5 years, 5 months, 14 days.
Years
5
Months
5
Days
14
Total days apart
1,991
Frequently Asked Questions about the Age Difference Calculator
How do you calculate the age difference between two people?
Subtract the earlier birth date from the later one. The result is broken into years, months, and days using calendar math, accounting for varying month lengths and leap years.
What is considered a big age gap in a relationship?
Most research considers gaps under 5 years small, 5 to 10 years moderate, and over 10 years large. Compatibility depends far more on life stage and shared values than on the number itself.
What is the half plus seven rule?
A social guideline stating the youngest socially acceptable partner age is half your age plus seven. A 40 year old's minimum would be 27. It is a rough heuristic, not a scientific rule.
Do age-gap relationships last?
Studies show that very large gaps (over 10 years) correlate with slightly lower satisfaction over time, but communication, financial stability, and shared goals matter more than the gap itself.
Does the order of dates matter?
No. The calculator automatically identifies the older person and shows the absolute difference, so you can enter the dates in any order.