As our parents grow older we worry about if they are happy and healthy. We want them to be because they raised us and took care of us when we were small and weak. Its only fair that we take care of them as they grow and ironically become smaller and weaker. That said, the key towards making sure that our parents are happy and healthy is to make sure that they stay as active as possible. Being active is actually the key to being happy in our older age. For instance, studies have found that senior citizens in their …