I got my first horse when I was ten, and said pony was three years old and "broke". Now'a'days I would know (in the majority of cases) that no three year old is broke enough for a ten year old to be riding without assistance unless you mean all four legs are broke and it can't do squat. My parents knew very little about horses, and I had been taking lessons for a few years and seeing as we had the land I found myself on the back of a brand new pony! Then a few moments later I was in a pile on the ground. Some situations it works out, but certainly not mine. If this horse was a dead head it might have been okay, but this horse is the SMARTEST s-o-b you'll ever meet and knew the bounds of the authority of a little girl. Fast forward some years, and that same pony now shares his pasture with four others and I still ride him. It took years to get back to where I could ride him without fault from either one of us, be it fear or pain, but it took a lot of commitment. A lot of people are surprised even after that I'm still kickin, but I'm sure a lot of kids would have let that fear live in the back of their minds for the rest of their lives. I try not to let it get to me, but still when I think of riding that horse I get really nervous, but the second my butt touches the saddle, even if he is having a bad day, all of the nervous usually go away because I get to be there with him.
Sorry for the novel, but just my experience with parents who let their kids grow up with a young horse. I think getting my butt whopped by a horse in the long run made me a better person, but that is just because I never got to experience the clueless, only riding push-button horses phase and skipped right to a challenging, problem-horse.
I pretty much can't stand most of what people do, but I try and keep it to myself. When stubborn people start talking about all their horse knowledge I listen for as long as I can manage before I politely leave. I figure the ones willing to change will see that I'm doing something right and ask about it.