I got both my daughters into dirt bikes at an early age, and they loved it. They both became very good riders without any real injuries. ATGATT for them. My ex wife hated motorcycles, even refusing to let me have one. But she did not try to stop them from riding, because it would strain the already poor relationship with them. The oldest one wanted to get into racing MX. Even I said no to that. Some of the worst injuries I've had in my life were from racing MX as a teenager. And they weren't doing triple backflips back then. IMO, anyone who does something like that truly has a death wish. And they will eventually get their wish. Or worse.
Shortly after she turned 18, the youngest daughter decided she wanted to try street riding. Again I was against it, having about a zillion close calls, but she promised to stay out of town, and that we could go for rides together out on rural roads. She is on the short side at 5'4", so I got her a nice used Honda Rebel and a new helmet. To avoid spending another $1000, I elected to forgo the super expensive gear, and just made sure she had a heavy jacket, jeans, gloves, and boots. I myself am not an ATGATT rider, but this was my daughter. She got her permit, then, as I suspected, lost interest before it ran out (6 months in AZ) I was out about $2000 for the Rebel and helmet. Still have the helmet. I played with the little Rebel (meaning I spent money on it) for a couple of years, then sold it. I was actually glad she lost interest. Saved me a lot of lost sleep
About slippery things, one of the worst things about AZ is the slippery gooey stuff they use to fill cracks in the roads with up north. They have a large tank truck full of this goo, and a crew walking behind it with wands spraying it in the cracks (it is sprayed into the cracks hot, then solidifies to a point, but it is still plenty slippery. I've almost lost it more than one leaned over around a curve when I hit a patch of this stuff. As far as I can tell, it never hardens, and the state admits they have never done any traction tests on it, since the roads were apparently built for cars, not motorcycles