Randy Couture was one of how many fighters over the age of 40 to have won a UFC championship?

Context: Couture has competed in a record 16 title fights. He is tied for the record for the most wins in UFC Heavyweight Championship bouts with former UFC Heavyweight champion Stipe Miocic. He had the most title reigns in the UFC, with six. His last fight with Lyoto Machida marked his 24th fight in the UFC. He is the fourth member of the UFC Hall of Fame. He is one of only 2 over the age of 40 to have won a UFC championship fight, having done so four times. He is one of the few MMA champions to regain a title he had lost, and the only to have done it three times.

Answer: Randy Couture was one of two fighters over the age of 40 that won a UFC championship fight.