Middle-aged people are the least happy, with many struggling with the "double responsibility" of caring for children and elderly parents, according to a major report.
Even pensioners aged over 90 report better life satisfaction and happiness than those aged 40 to 59, the study from the Office for National Statistics (ONS) found.
Experts analysed personal wellbeing data for more than 300,000 adults in the UK, collected over three years from 2012 to 2015.
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They found that people aged 65 to 79 tended to report the highest average levels of personal wellbeing, while those aged 40 to 59 were struggling.