My father has built over a dozen cars and I mean from "scratch". He did his first one when he was 19 and it has been his hobby ever since. Right now he's working on a '67 Corvette. He has a full-time career, but cars are his passion. I have a friend who is 24 and he has built 3 already, his first was at the age of 17. I could never do it, but some people just have a natural talent.