Sibling Age Difference Calculator
Find the exact age gap between siblings.
Age Difference
5y 0m 0d
How This Works
This calculates the true calendar gap between two birth dates — years, months and days — the same way you'd count it by hand, correctly handling different month lengths and leap years.
Formula
Age Difference = Later Birth Date − Earlier Birth Date
Example
A parent born in 1985 and a child born in 2015 have a 30-year age gap.
Frequently Asked Questions
What is the age difference between someone born January 1, 1985 and January 1, 1990?
The age difference is 5 years, 0 months and 0 days.