Qualifications: Literally all the qualifications. Oldest fighter to win a UFC belt. (44 years old) Oldest fighter to defend a UFC belt. (45 years old) Oldest fighter to win a UFC fight. (48 years old) One of only 2 fighters to have held 2 UFC belts in different divisions. (Randy Couture, BJ Penn) Won the most UFC belts of all time with 5 belts and an interim belt.