06/18/2009 05:12 am ET Updated Nov 17, 2011

Happiness Is ... Being Old, Male and Republican?

Americans grow happier as they age, surveys find. And a new Pew Research Center survey shows the tendency is holding up as the economy tanks.

Happiness is a complex thing. Past studies have found that happiness is partly inherited, that Republicans are happier than Democrats, and that old men tend to be happier than old women.

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