What year was I born if I'm 21?
2004 or 2005
Anyone who is 21 today, Friday, November 13, 2026, was born between Sunday, November 14, 2004 and Sunday, November 13, 2005. The boundary falls in the middle of the year, so the answer spans two of them.
- Earliest birth date
- November 14, 2004
- Latest birth date
- November 13, 2005
- Birth years
- 2004 or 2005
- Age today
- 21
Which year, exactly
Someone born on Sunday, November 13, 2005 turns 21 today. Someone born a day later, on Monday, November 14, 2005, is still 20 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 21 today, a date of birth has to fall on or after Sunday, November 14, 2004 and on or before Sunday, November 13, 2005.
There is no 29 February in that window, so everyone who is 21 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 2004from November 14, 2004
- Born in 2005up to November 13, 2005