Is your city keeping you young? The RealAge Test calculates how quickly -- or slowly -- a person's body is aging compared to his or her chronological age. For the RealAge 2012 Youngest & Oldest Cities in America report, we analyzed RealAge Test data from more than 28 million people to rank America's 50 largest metropolitan areas and uncover the best places to stay young. Find out how your favorite cities fared.

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