Iron Mike Tyson was the youngest heavy weight champion ever at 20 years old.
Randy Orton was the youngest World Heavyweight Champion
He beat Trevor Berbick
yes
He was world heavyweight boxing champion from 1952 until his retirement in '56.
Steven Hendry is the youngest ever. Previous to him it was Alex Higgins.
Type your answer here... wilfredo benitez
Bobby Fisher
Yulla Habub
When he was 15 Ian Thorpe won the 400 meter freestyle at the world championships. This made him the youngest male swimming world champion ever.
Matty b raps
Seve Ballesteros.