Seriously this is what this hobby has come to?...(urge to rant rising)
I've been in this hobby for 30 years; and I'm 36 now (even you guys can do that math). My step father had 3 machines when I was 6; only one worked, I played that dipsy doodle for hours on end for years.
While a visionary in the collecting of pinball, my step father is not mechanically or electrically inclined at all. So he would hire pinball repair guys to come to the house and fix machines as the collection grew. I was the kid assigned to hang out with the repair guy and report the problems with game play.
Those hours hanging out with the repair guys formed the basis for all of my repair skills today. And while I don't ever have to call someone to come fix a machine; I do have the benefit of all of you (and the internet) which we didn't have the wide spread benefit of back then.
But every part of my machine that is repaired I show my kids what I'm doing, and how it works. Forming the basis of a lifetime of I what hope is in innate sense of "hey I bet I can figure that out" whatever "that" might be.
I have 3 kids; and they've been allowed to play every machine I have since birth. These are commercial grade machines; meant to be put on location and banged on by the general public. If that thought frightens you then go apply another coat of wax to that vintage car in the garage; I'll be out enjoying my 65 mustang on the road!