So you've made it through middle age and now you're officially a "senior" citizen, somewhere around the age of 65 when most people become eligible for Medicare. It seems that suddenly being eligible for Medicare is a turning point into older age for many people, although there are many others who say that turning 70 is really the birthday that feels they've finally moved into "old age." At 70 or older, the children are long gone (at least there should be no more adult childr