Ummmm, I'm 15. Bought my truck at 14 with my own hard earned money. Now i'm in the middle of a frame-off restoration.
I have pretty much taught myself everything I know about mechanical stuff. I have also learned a bunch on this board and in the chat room, thanks to Josh and Slowformula (among others).
Here's what I built at 14 (friend driving)
Here's the 71 i'm workin on now.