Experiences in youth shape our health in old age. That's the key lesson from the world's longest-running medical study. iStockphoto.com hide caption

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Death investigations among seniors are often skipped, leaving the growing population vulnerable to neglect and abuse. Andres Cediel/Frontline hide caption

itoggle caption Andres Cediel/Frontline

One takeaway point of the research is that older women should try to reduce the chances of getting a hip fracture, the lead author of the study said. iStockphoto.com hide caption

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Tennessee women's basketball coach Pat Summitt sits with her dog at her home in Knoxville, Tenn. Summitt plans to coach "as long as the good Lord is willing" despite recently being diagnosed with early onset dementia. Debby Jennings/AP/University of Tennessee hide caption

itoggle caption Debby Jennings/AP/University of Tennessee