There have been a lot of studies conducted on the influence of music. In the elderly people, music has been shown to not only reduce tension and anxiety but also helps reduce the feeling of isolation and solitude. And a surprising revelation of this study was that the subjects enrolled for this study showed an increased production of human growth hormone, which has a positive effect on the side effects of aging like wrinkling, osteoporosis, general aches and pains and even sexual function
I found this amazing site about music.
A good place to START if you don't want someone else wiping your arse when you get old