Study participants were trained in practical reasoning skills like managing medications. Jorge Salcedo/iStockphoto hide caption

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Playing this game won't make you feel older, unless you're already getting up there in age. iStockphoto.com hide caption

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Strenuous mental exercise like reading difficult books, solving tricky math problems — or, maybe, playing the right video game — can help keep a healthy brain sharp, research suggests. Images.com/Corbis hide caption

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