Just like any machine, different body parts sometimes go wrong from old age. In fact, a study in the U.S. found that 60 percent to 7o percent of all patients in the Emergency Room were aged 75 or over. Fortunately, older people who suffer from an illness or injury can now receive treatment to help extend their lives. Due to the increase in the population of elderly people, gerontology is now one of the fastest growing areas of medicine. It is now common for older people with damaged joints, for example, to have surgery to replace the old joint with a new one made of plastic or metal As with any machine, the better you take care of it, the longer it will last. Of course, the best way to take care of your amazing machine is to eat the right foods, do regular exercise, and get enough sleep. Oh, and don't forget to smile!