1. Alexander Povetkin - 224 rounds in 35 fights 2. Kubrat Pulev - 174 rounds in 26 fights 3. Tyson Fury - 150 rounds in 26 fights 4. Joseph Parker - 147 rounds in 26 fights 5. Luis Ortiz - 135 rounds in 32 fights 6. Deontay Wilder - 124 rounds in 40 fights 7. Dillian Whyte - 122 rounds in 25 fights 8. Jarrell Miller - 83 rounds in 22 fights 9. Anthony Joshua - 77 rounds in 21 fights 10. Dominic Breazeale - 77 rounds in 20 fights A fighters longevity is mainly determined by wear and tear, natural ability and age. This tells us that Povetkin is probably the fighter who is most away from his prime but he is still looking good at 39 years old. Whyte, Miller, Joshua, Parker and Breazeale are only getting started and they have a lot more years to go. Wilder despite being a professional boxer since almost 10 years only fought 124 rounds in 40 fights, considering his superior athleticism and age of 33 years he is having AT LEAST 5 more years to go on the same level imo. Ortiz is not nearly as shot as a lot of people claim, he doesn't have many miles on the clock and he will be a force to be reckoned with for the next 3 years. I know there are a lot of other variables to consider, it was just a thought, i'm not stating opinion as a fact.
