The original version of Superman's origin had him becoming a superhero when full grown. However, in 1945 DC introduced Superboy as an addition to Superman's backstory, retconning in prequels and earlier meetings with DC characters. From 2006 to 2008, an Animated Adaptation came along, taking the most iconic versions of all involved (but taking even more inspiration from the DCAU, despite, judging by Brainiac 5's being an android, not being in continuity with it.) See Here for that series. There is a character sheet. The "five years later" version: The reboot version: The threeboot version: