Age Difference Calculator.
Compare two dates of birth to see the exact age difference.
Age difference
Breakdown
Total months
Total weeks
Total days
Total hours
Total minutes
Total seconds
Understanding age differences.
Age differences between two people are often quoted simply in years, but the actual difference depends on the specific birth dates. Two people both "born in 1990" could have an age difference of nearly 12 months if one was born in January and the other in December.
Our calculator provides the precise difference down to the day, which is more useful for legal purposes (age of consent, retirement eligibility), educational cutoffs (school enrollment dates), and personal curiosity.
This tool is useful for couples curious about their exact age gap, parents comparing children's ages, or anyone needing to calculate the precise difference between two dates of birth. For a general duration between any two dates, see our Date Duration Calculator.
Frequently asked questions.
Quick answers to common questions about age calculation.
How does the Age Difference Calculator work?
Can I compare ages of people born in different centuries?
Does the order of the dates matter?
What if both people have the same birthday?
How is this different from the Date Duration Calculator?
Related tools.
Explore our other free date and age calculators.