Oldest champions: since 2001
Oldest fighters to win an undisputed UFC title, by age on the day.
Reigns are derived from championship bouts. When a belt was vacated or stripped outside a title fight, the reign is shown ending at the next title fight in that division, so a few run long; a title awarded without a fight (José Aldo's in 2010, for one) starts at the champion's first UFC title fight.
102 fighters.
| # | Fighter | Age | Division | Won | Ended |
|---|---|---|---|---|---|
| 101 | Josh Barnett | 24 years, 132 days | Heavyweight | Mar 22, 2002 | Sep 27, 2002 |
| 102 | Joshua Van | 24 years, 57 days | Flyweight | Dec 6, 2025 | Champion |