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.

The findings appeared in the Proceedings of the National Academy of Sciences.

Happiness is not the only thing that apparently improves with age. In a study, people in their eighties reported the fewest problems with the quality of their sleep.

Researchers surveyed more than one hundred fifty thousand American adults. The study, led by Michael Grandner at the University of Pennsylvania, appeared in the journal Sleep.

The original goal was to confirm the popular belief that aging is connected with increased sleep problems. The survey did find an increase during middle age, especially in women. But except for that, people reported that they felt their sleep quality improved as they got older.

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