Reverse Age Calculator
Turn an age into a birth year, or a birth year into an age.
To find your birth year from your age, subtract your age from the current year, allowing for whether your birthday has passed. Enter your age and a reference date and this calculator returns the two possible birth years and the exact birth-date range, or works the other way from a birth year.
Reverse Age
Age to birth year, and back
Work backwards from an age
The reverse age calculator turns an age into a birth date, or a birth year into an age. Enter how old you are and it tells you which year you were born and the exact date window that produces that age; enter a birth year and it tells you how old you are now and later this year. It’s the quick way to fill in a form, verify an age from a birth year, or check a milestone.
Because a single age spans a twelve-month window, the calculator shows the two possible birth years — one if your birthday has already happened this year, and one if it hasn’t — along with the precise range of birth dates that matches.
Age to birth year, and back
In “age → birth year” mode you can also add a number of months for a tighter estimate of the birth date. In “birth year → age” mode, enter a year (or a full date) to see the age reached this year. For the reasoning behind these, our guide on how old am I if I was born in a given year walks through the edge cases.
Related tools
To go from a birth date to an exact age, use the main age calculator. To find the date you’ll reach a specific age, see when will I turn a certain age, and to count total days lived, the age in days calculator.
Common questions
What year was I born if I am a certain age?
Why does it show two possible birth years?
Can I find my age from just my birth year?
Is the birth date exact?
- Method: derives the birth-year window from an age as on a reference date; the two candidate years reflect whether the birthday has already passed.
- Reference: see how old am I if I was born in a given year.
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