I don't know anyone personally in here who at one point of their life couldn't kick to the head. For me I used to train karate so for many years high kicks were a thing to strive for. It wasn't until I took Kung Fu, that my perspective changed on that. My first kung fu class was in my early 20's and that's when I started learning how to exploit high kicks. It wasn't until my late 20's that I really started to restrict high kicks. I would try to maintain the flexibility but that's about it. A lot of people here have taken other martial arts as well. Some of us are at an age where the flexibility isn't what it used to be. So they may not be able to kick high now, but have had experience in doing so. Others may have learned through example or through their teaching about the risk of kicking too high. Others may have learned through watching fights with people kicking high. I've seen enough TKD fights to expect that if they are kicking high that one of them will fall while trying to kick. I did a search on TKD fights. This was the second video that I picked. This is the fourth video So even if a person has never kicked high before, one can analyze videos of high kicks and arrive to a theory about the risks one opens themselves up to when kicking high. If you like kick high, then kick away until your happy. No one is saying to hate kicking high.