Think about it, most of us here probably got our start with this kind of knowledge by tagging along with somebody else as they performed the work.
When I was around 5 or so, I helped my Dad tear down and rebuild an old Farmall Cub tractor. He dragged me along any time he had a project that needed to be worked on. I can't even come close to listing all of the things we used to work on. Cars, Trailers, Tractors, Plumbing, Electrical, plumbing, electronics, and so on. I may not have remembered all the details, but I picked up the most important lesson from all these things, which is not to be afraid of getting in there and doing it. The knowledge is part of it, but the mindset is even more important.
But the simple fact is that I got started in all of this because somebody else spent the time to start teaching me when I was still young and impressionable. I can already see my Daughter starting to pick up on the basics, and she's only 2 1/2 years old. But she already loves to help me work on my models... even if she is mostly just in the way, it's still great to see her wanting to get involved.