Here is my list of fighters,

1 Dwight Braxtron 25
2 Ron Lyle 29
3 Nate Campbel 25
4 Ray Mercer age 23
5 Choi Tseveenpurev age 22

Braxton is the BOMB.
Scott Pemberton

Marciano was 25
Earnie Shavers was 22 or 23