My kids have been through three trampolines in sixteen years. If the aren't jumping on them, they are doing school work on them (in the spring and fall), or they are having sleepovers on them during the summer. We have a few friends that are doctors and they absolutely love trampolines because they said that their waiting rooms are always full of kids that have injured themselves on trampolines. We looked up the statistics and a lot of head and neck traumas do occur on trampolines which probably keeps emergency room doctors busy as well. I am fifty one and I am still jumping on the trampoline...and having a lot of fun doing it!