Age by birth year calculator
When only the birth year is known, such as born in 1990, the age is one of two numbers depending on whether this year's birthday has passed.
Loading the tool…
Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter birth year and today's date.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Age after the birthday = year of the calculation date − birth year. Age before the birthday = that number − 1.
Example
Inputs: Birth year = 1,990, Today's date = 2026-09-30. Result: Age this year: 35 or 36; After the birthday: 36; Before the birthday: 35.
Limits and caveats
- Without the day and month a single figure is not possible, so the tool shows both possible ages.
Questions about this tool
How old are people born in 2000 during 2026?
They are 26 after their 2026 birthday and 25 before it.
How can I get an exact age?
Use the age calculator in years, months and days with the full birth date.
Can I check a year other than the current one?
Yes. Change the today field to any date in the year you want.