Superman as he specifically was in the Kingdom Come possible future/Elseworld. He does get better with age.
Writeups.org is an encyclopaedia of characters in genre fiction — super-hero comic books, video games, action movies, etc. It offers illustrated, researched profiles. These also include technical data for role-players. If you need a robust understanding of a character’s abilities, personality, history, etc. this is *the* place to be.