My Dad had a garage business, probably around 10/11 maybe younger, by 11/12 or so, I was differently helping out around the shop. One of my 1st jobs was stripping parts cars and installing stereo's in cars he would sale.
First performance attempt was putting a V6 in a chevette around 13, never got finished, second was fixing up a 68 Dart was to be my first car but was stolen before I turned 16.