New research on the life expectancies of U.S. citizens indicates Asian-American women living in Bergen County, N.J., lead the nation in longevity, usually reaching their 91st birthdays. Conversely, the shortest lifespan is seen among American Indian men in parts of South Dakota, where the typical length of life is only 58 years. Researchers said they found longevity rates took the shape of "eight Americas," and ethnic or racial makeup, region, and income played major roles.

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