All depending where you live. I grow up on a farm and did my riding like an idiot on bicycles everywhere it was possible on sand, gravel, ice mud, and 12 years started/learned to ride Yamaha 80cc enduro, and my first lisence for small motorbike 16 years old, big motorbike 18, and now got 4 different sized motorbikes in my garage at our farm.
No doubt I Would teach them and let them push their limits if they had the feeling for riding. If not, I would be happy to not let them start riding.
Most motorbike accidents could have been avoided with proper training of all drivers in thailand and especially motorbike riders.
Riding motorbikes is dangerous, but as long you understand it is dangerous and you learn to read patterns, it will become less dangerous