Dan Buettner has some advice: eat less, and more vegetables, have a spiritual or religious faith that is affirmed in a community, integrate moderate exercize into your everyday life (walking is cool), and respect the old. But he puts it so much more persuasively than a summary:
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http://www.theatlantic.com/daily-dish/archive/2010/01/how-to-live-to-90/191936/
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http://www.theatlantic.com/daily-dish/archive/2010/01/how-to-live-to-90/191936/
