Biological Aging
Unlike an automobile which wears out with time, the body has cellular mechanisms that allow for internal repair. Why do cells eventually slow down and lose their ability to replicate? That should be the focus of your paper. I recommend investigating the role of genes in controlling our biological clocks. Do not write a paper on the social consequences of aging.
Web site on Telomeres - the genetic control for aging. Excellent Site -- you need to understand the relationship of telomeres and aging! Unlimited links.
Buck Institute on Advanced Aging Research. May find some good links.