Birth year lookup · live in 2026
How old is someone born in…?
Pick a year from 1900 to 2026 to see possible age as of 26 September 2026, compare dates, and calculate the exact birthday age. Every year page moves forward with the calendar.
Find a birth year
A birth year gives a one-year range. The precise month and day determine whether the birthday has already passed. All 127 year pages show the month guide, milestone years and future age table.
Why two ages?
The birthday is the missing detail
Subtracting the birth year from 2026 gives the age a person turns during 2026. Until that birthday, their completed age is one year lower. A person born in 2000 is 25 or 26 today. Entering the month and day resolves the difference. The exact calculator also works for a school date, anniversary or future reference date.
More than a year estimate
Each year page includes an interactive custom date calculator, five date shortcuts, a 12-month comparison for today, 1 January and 1 August, a seven-year table, milestone calendar and contextual FAQs.
Reverse birth-year lookup
If I am 26, what year was I born?
A completed age covers a range of birthdays. Because birthdays fall across 365 days, a single age always maps to two possible calendar birth years depending on whether your birthday has passed this year.
Quick Age to Birth Year Guide (2026)
If you already know the birth month and day, use an individual birth-year page for exact years, months and days. For exam age, use the notification cutoff and rule in the exam checker.
What Year Was I Born? Calculator
Example values are loaded. Edit any field to get your own answer instantly.
Possible birth dates for someone aged 25 completed years on 26 September 2026: 27 September 2000 through 26 September 2001. A known month and day narrows the range to one date.
Dates stay in this browser while you use the tool. The calculation does not require an account.