If I Am 30, What Year Was I Born?
Find the year someone was born from their current age — with both possible years shown when you are not sure whether their birthday has passed.
Result
This page loads the birth year calculator with age 30 in place. Confirm whether your birthday has passed this year and run it — the subtraction uses the current year read from your device at that moment, never a year frozen into the page.
Thirty gives two possibilities: current year minus 30 when the birthday is behind you, current year minus 31 when it is still ahead. That second case is the one people forget — you spend the months before your birthday still carrying last year's subtraction. The "not sure" mode prints both years with the math spelled out.
The round number makes 30 a favourite for anniversaries, reunion planning and "class of" guesses: from the birth year you can estimate school and university graduation cohorts. For the exact age in years, months and days from a full birth date, our age calculator is the tool to use.