Before Bob Ross, I watched Bill Alexander who I believe taught Bob Ross the wet-on-wet technique. I don't know how young I was. Once, maybe in my 20s, I bought some paints and all of that and did a few paintings that way myself. I didn't stay interested in it very long, but I did have some of Bill's odorless paint thinner that lasted forever !
We the computer and places like youtube, generation after generation can learn from some of the same people. I would have never imagined it back in my day.