Chiropractic care, is not just for "back pain." It is used for the wellness of your entire body. Joints, muscles, organs, digestive system, IBS, reflux, detoxing, pain, misalignment, injuries, ear infections, etc. Chiropractic care, is not a cure-all, and should not be used for some things, some people, some injuries, etc. However, it can be used as a preventative to many things.
My son has been seeing a chiropractor since birth. He is very healthy, at 3. he has been mildly sick once in his life. Chiropractic care is certainly not solely responsible for that, but it has certainly helped! I was an assistant for a long time, I have only seen chiropractic not work for a handful of people. Those people needed therapies that could not be offered by a chiropractor. Seeing a chiropractor can better just about anyone. Even when they can't get certain things treated there. It's not all about being cracked and popped. In fact, you can get care that doesn't even involve that. I have seen the same chiropractor for years, and have only been "popped" once. He does many, many other things.