Sixty five to 79 is the happiest age group for adults, according to Office for National Statistics research.
Those aged 45 to 59 reported the lowest levels of life satisfaction, with men on average less satisfied than women. That age group also reported the highest levels of anxiety.
Researchers said one possible reason for the lower happiness and well-being scores among this age group might be the burden of having to care for children and elderly parents at the same time.
The struggle to balance work and family commitments might also be a factor, they said.
Meanwhile, those who were younger or retired had more free time to spend on activities which promoted their well being, the researchers suggested.
Happiness and well-being dropped off again in those over 80, however, with researchers suggesting this could be down to personal circumstances such as poor health, living alone and feelings of loneliness.
The survey asked people to rate out of 10 how happy and how anxious they had felt the day before, how satisfied they were with their life generally, and how much they felt what they did in life was worthwhile.
The published results have been broken down by age, ethnicity, religion, marital status, employment status, religion, and where in the country people live.
- Married people had the highest levels of happiness, averaging 7.67 out of 10, higher than co-habiting, single, widowed or divorced people
- People with jobs were happier than unemployed people, with part-time workers the happiest. Of those are were not working, retirees had the highest levels of happiness, followed by students
- Of those who followed a religion, Hindus were marginally the happiest on average, followed by Christians and Sikhs, while those who followed no religion were the least happy
- Women on average reported higher levels of anxiety than men, but were more likely report better well being and feel their life was worthwhile
- People of Arab ethnicity were found to be the most anxious ethnic group, with people of Chinese ethnicity the least anxious
- Northern Ireland held on to the crown for happiest of the UK’s nations, with people there also most satisfied and most likely to say their life was worthwhile – but also the most anxious; the least happy people were in England, with the North East the unhappiest region
Researchers found a strong link between health and well-being.
People who said their health was very good reported an average life satisfaction rating of 8.01 out of 10, compared with people who said they were in very bad health, whose average rating was just 4.91.