Here's a PBS video about people in their 30s who have figured out how to save the money they earned in their 20s so they never have to work again.
PBS: Adeney saves so much because he's also a do-it-yourselfer. Take his house.
Pete Adeney: The one that we live in now, I built almost entirely from scratch.
PBS: So you put in your own plumbing?
Pete Adeney: Yes.
PBS: You did your own flooring?
Pete Adeney: Yes, that's part of a house.
PBS: You did your own electricity?
Pete Adeney: I would do my own heart surgery if it was safe.