I bought my own Honda 50 when I was about 9 or 10 from a neighborhood kid for $30 when he couldn't get it to crank. I pushed it home, put a new plug in it and took off. I knew what the controls were, don't remember how, and pretty much taught myself. After that my dad got a Suzuki dualsport 400, don't remember the model, and I could ride it when I could barely touch the pegs. I'd kickstart it on the side stand and ride it off, to stop I had to come to a stop and slide off the seat to touch the ground on one side. Then I started riding on the street in 98 or 99. I was way rusty, it was easier when I was 10
It didn't take me long to get the basics back but it was a good 2-3 years before I'd say I was "good" again.