The study surveyed about 21,000 men and 25,000 women nationwide.
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Study: Men, women flip-flop being happy
Researchers at USC say early on, women are more likely than men to be in a relationship, giving them greater fulfillment in reaching their family and material goals, but by the late 40s, women are less likely to be in unions, and become less happy, while men are achieving their financial goals and becoming happier.
