humble beginnings

An old man finding himself inside a young body in jjk, namely the younger brother of Miguel, he will act according to his age and the circumstances, what entails is that he ofcourse will have a certain amount of wisdom and will be able to adapt fast, he has to familiarize himself with the world first though, since he read jjk 30 years ago till the start of the culling games.
English is my third language and I‘m just 16 so bare with me if I make any mistakes, pointing them out would be appreciated though :)