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7. So why would happiness increase with age? One theory is that, as people get older, they become more thankful for what they have and have better control of their emotions. They also spend less time thinking about bad experiences.
8. The findings appeared in the Proceedings of the National Academy of Sciences.
9. Happiness is not the only thing that apparently improves with age. In a study published this year, people in their 80s reported the fewest problems with the quality of their sleep.
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