What year was I born if I'm 40?
1985 or 1986
Anyone who is 40 today, Friday, November 13, 2026, was born between Thursday, November 14, 1985 and Thursday, November 13, 1986. The boundary falls in the middle of the year, so the answer spans two of them.
- Earliest birth date
- November 14, 1985
- Latest birth date
- November 13, 1986
- Birth years
- 1985 or 1986
- Age today
- 40
Which year, exactly
Someone born on Thursday, November 13, 1986 turns 40 today. Someone born a day later, on Friday, November 14, 1986, is still 39 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 40 today, a date of birth has to fall on or after Thursday, November 14, 1985 and on or before Thursday, November 13, 1986.
There is no 29 February in that window, so everyone who is 40 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 1985from November 14, 1985
- Born in 1986up to November 13, 1986