10. Randy Couture
Couture takes this list to the next level. First of all, he’s the only UFC fighter to have won a title after entering the Hall of Fame. That’s only one of his many elite accolades. He’s a six-time champion across two weight classes. Some even believe that he’s the greatest heavyweight of all-time.
If he’s not the greatest, Couture was definitely the oldest. After a brief retirement, he decided to come back and fight again at the age of 43. Then he smashed Tim Sylvia and secured the crown again. To sum it up, Couture would continue fighting until he was 46.