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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Madeline Mann seen shortly after she was born prematurely in in 1989. Weighing 9.9 ounces at birth, she is now an honors student in psychology at Augustana College in Rock Island, Ill. A. Hayashi, Loyola University Medical Center/AP hide caption

itoggle caption A. Hayashi, Loyola University Medical Center/AP

Youths drink beer in a Paris cafe. Jacques Brinon /AP hide caption

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Foster care children are much more likely to be prescribed psychotropic drugs, a federal report finds. iStockphoto.com hide caption

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With a little help and guidance, epileptic teens can have most of the same experiences as their peers, including learning to drive. iStockphoto.com hide caption

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Michele Pereira, who questions the schedule of mandatory vaccines, sat with her daughters, Evangeline, 6, right, and Genevieve, 2, at a park in Ashland, Ore., earlier this month. Jeff Barnard/AP hide caption

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For fans of TV chef Paula Deen (seen here in a photo from 2006), her appeal lies not in the recipes, but in that feeling that she's talking just to you. Courtesy of Food Network/AP hide caption

itoggle caption Courtesy of Food Network/AP