Joe Louis or Joseph Louis Barrow the "Brown Bomber".
Mike Tyson hold the record for the youngest heavyweight champion of the world at 20 years, 4 months and 22 days old
At 45 years old, George Foreman.
He was 24 years old
Joe Frazier Joe Frazier
George Foreman was 46 when he was still the IBF Heavyweight Champion, and he was 48 years old when he was still the WBU Champion of the World. Archie Moore W15 Glulio Rinaldi-47 years old, Light Heavyweight (1961). Boxrec and other sources have him born on December 13, 1916, which would have made him 44, not 47.
Triple H is a thirteen-time World Champion: an eight-time WWE Champion, and a five-time World Heavyweight Champion. And he has many more years left in his career. So probably he will beat Flairs record of 16 world titles.
Eugene Spencer aka IRONLION at 18 years old from Pennsylvania in Big Japan Pro Wrestling Adam Page at 17 years old, heavyweight champion for pure pro wrestling in North Carolina
Jersey Joe Walcott was the heavyweight boxing champion of the world. He was 37 years old when he won the title.
Brock Edward Lesnar three-time WWE Champion, is the youngest WWE Champion in history age 25.He Became the youngest WWE champion by defeating Dwayne "The Rock" Johnson at Summerslam 2002Randy Orton is the youngest world heavyweight champion age 24
Shawn Michaels is a Three-Time WWE Champion, and a One-Time World Heavyweight Champion. He won the Three WWE Championships in 1996 and 1997 twice. He won the Heavyweight Championship in 2002.
George Foreman (45 years old. Knocked Out Michael Moorer in the 10th back in 1994)
Can a bigginer can be tennis world champion in five years?