If I remember correctly, he was crucified at 33. He started his public ministry at 30. I think we don't see much written in scripture about his early life because it doesn't fit the purpose of scripture. The gospel writers then didn't work like tell-all news exposés do today when they detail every little thing down to what shoe size the subject was wearing in second grade. The scriptures were written with the purposes of comforting believers and evangelizing non-believers. (That's probably too simplistic a view of scripture, but I'm a little too distracted with the baby and a cat scratching at the door to think clearly.) Church tradition may have a few stories to tell, but I'm not familiar enough with orthodox tradition to know many stories. The only one I remember hearing was that when Jesus was a small child, he was making a pair of clay pigeons. Supposedly, he clapped his hands and the pigeons came to life and flew away. I don't remember the source on that, though, so I don't put a whole lot of stock into it.