Research suggests that the age of greatest happiness varies depending on the study and the definition of happiness used. However, several studies point to a later stage in life.
Findings from Multiple Studies
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Age 70: Multiple studies, including research published in September 2023 (https://cordis.europa.eu/article/id/446730-at-what-age-are-we-happiest), indicate that people report the highest levels of happiness around age 70. This research shows that life satisfaction dips between ages 9 and 16, rises until 70, and then declines again.
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Older Age Groups: Other research points to increasing happiness and self-assurance in later life. Studies show those in their 60s are more likely to be happier (https://www.buzzfeed.com/lindsayholmes/age-most-people-feel-happiest). One explanation suggests that this correlates with reduced stress and acceptance of life's realities.
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U-Shaped Curve: Some research suggests a U-shaped curve where happiness is high in younger adulthood (20s), dips in middle age (around 50), and then rises again in later life (https://www.xcode.life/genes-and-personality/at-what-age-are-people-the-happiest/).
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Individual Variation: It's crucial to remember that happiness is subjective. Individual experiences and circumstances significantly impact happiness levels at any age. Anecdotal evidence from sources like Reddit (https://www.reddit.com/r/AskOldPeople/comments/1blc9sj/how_old_are_you_and_at_what_age_have_you_been/) highlights the wide range of personal experiences regarding happiness across the lifespan.
Conclusion
While research offers some insights, pinpointing a single "happiest age" remains elusive. Several studies indicate a trend towards higher happiness in later life, particularly around age 70, but individual experiences play a crucial role.