This has been addressed in your situation as you say most players are late 20s+. Buuuuut, There have been several suggestions to keep it in a close knit group of friends. THIS ONLY WORKS FOR ADULTS, and even not always then. If you go shoot out little jimmys eye, i dont care how close you think you are his parents are going to have a serious problem. Somebody is going to have a stack of medical bills and i doubt your "i wont sue you" arrangement will hold up. This is not for acidpaintball but for the many minors who may be getting ideas from this thread.