The British Standards Institution, which commissioned the survey, said the results showed the need for employers and the government to take steps to help older women remain in the labour market.
Caring responsibilities and a lack of flexibility in work were both cited as barriers to work by about one in five respondents.
Some 32% of British women aged 50 to 64 were not in work or seeking work in the first quarter of this year, compared with 22% of similarly aged men, official data shows.
For men and women aged 25 to 34, the comparable rates were 16% and 8%.
The BSI did not survey men to see how their reasons for leaving the labour market as they age compared to women's.
Persons:
Anne Hayes, Hayes, William Schomberg, David Milliken
Organizations:
British Standards Institution, Sectors, BSI, Thomson
Locations:
Britain