When I was a kid, I rode like an idiot, wheelies, burn-outs, doughnuts on lawns, up stairs, through buildings, etc.
The only reason I survived, was because I was riding a Jawa 90.
Any parent who allows their inexperienced teenager to buy a 150 mph bike, or buys one for them, ought to be charged with gross neglegence.
It would be akin to teaching your kid how to shoot with an M-60, or SAW.