The number of people saving into an occupational scheme has fallen by about 500,000 since 2010, according to figures from the Department for Work and Pensions (DWP).
The decline in savers was similar for both men and women at about 300,000 between 2010 and 2012, with those aged 35 to 44 accounting for half of the total decrease in membership.
Although the DWP observed that participation in workplace saving generally increases with age, the data revealed membership tended to peak between 45 and 49 before tailing off again.
In 2012, the number of 22-24 year olds saving into an employer-sponsored pension was the same as for men aged 60-64 at 300,000.
The DWP figures, sourced from the Annual Survey of Hours and Earnings from the Office for National Statistics, showed the total membership was 10.8 million in 2012, compared to 11.3 million in 2010.
More men than women saved into a pension but the proportion of women who save was higher than the proportion of men, the DWP said.
According to the findings, 5.7 million men were investing in an employer-sponsored pension scheme in 2012, compared to 5.1 million women.
The average age men stopped working between October and December 2012 was 64.6, compared to 62.8 for women.
Over the last two years, the typical retirement age has risen by 0.2 years for men and 0.4 years for women.
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