yet i do feel that certain people reach physical maturity much earlier than others. No doubt the 13 year old Mike Tyson was much closer to his physical manhood than the 17 year old version of someone like me, who didn't have a man's physical attributes until about the age of 23 or so. Genetically Tyson was going to be a manly beast from an early age - others, like Pacquiao, need to mature and are still boys and very beatable at that age, as his early fights attest. No amount of training will turn a 14 year old boy into a beast unless it is written in the stars.
Tyson could probaly ate everything he wanted. His calorie burn was insane. Food wasn't really big science in the eighties.