5. George Foreman
Foreman is the oldest heavyweight boxing champion ever. The Olympic gold medalist turned professional in 1967. Who could have known that he’d be fighting until 1997? ‘Big George’ first won the heavyweight title in 1973 when he beat Joe Frazier. But he’d drop the belt to Muhammad Ali in ‘The Rumble in the Jungle.’
He retired for 10 years after becoming disillusioned with the sport. However, this elite talent couldn’t stay on the side. In 1995, Foreman knocked out 26-year-old Michael Moorer to win the unified WBA, IBF, and lineal titles. He was 45, the oldest heavyweight champion ever and the second oldest boxing champion behind Bernard Hopkins.