What year was I born if I'm 100?
1925 or 1926
Anyone who is 100 today, Thursday, September 24, 2026, was born between Friday, September 25, 1925 and Friday, September 24, 1926. The boundary falls in the middle of the year, so the answer spans two of them.
- Earliest birth date
- September 25, 1925
- Latest birth date
- September 24, 1926
- Birth years
- 1925 or 1926
- Age today
- 100
Which year, exactly
Someone born on Friday, September 24, 1926 turns 100 today. Someone born a day later, on Saturday, September 25, 1926, is still 99 until tomorrow. That is why “what year” has two answers rather than one, and why a birth date rather than a year is what settles it.
Read the other way round: to be exactly 100 today, a date of birth has to fall on or after Friday, September 25, 1925 and on or before Friday, September 24, 1926.
There is no 29 February in that window, so everyone who is 100 today has had a birthday every year since they were born. Twenty-five of the hundred ages on this site do span a leap day; this is not one of them.
The two candidate years
- Born in 1925from September 25, 1925
- Born in 1926up to September 24, 1926