The study also showed that men and women have similar emotional patterns as they grow older. However, women at all ages reported more sadness, stress and worry than men.
The findings appeared in the Proceedings of the National Academy of Sciences.
Researchers say they do not know why happiness increases as people get older. One theory is that, as people grow older, they grow more thankful for what they have and have better control of their emotions. They also spend less time thinking about bad experiences.
Professor Stone says the emotional patterns could be linked to changes in how people see the world, or maybe even changes in brain chemistry.
The researchers also considered possible influences like having young children, being unemployed or being single. But they found that influences like these did not affect the levels of happiness and well-being related to age.
And that's the VOA Special English Health Report, written by Brianna Blake. Tell us what you think about the relationship between happiness and age. You can post comments on our website, voaspecialenglish.com, or on Facebook and Twitter at VOA Learning English. I'm Barbara Klein.
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2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25