An additional 44% expected to work beyond their normal state pension age, typically 66 or 67.
Of those expecting to work beyond state pension age, 43% surveyed by Canada Life think their pension income will not be enough to retire fully - their main reason for postponing retirement.
A quarter (22%) said they would continue to work as they were unsure how long their retirement savings would last, while 10% said they were prepared for retirement but their current lifestyle meant it was too expensive for them to retire.
The biggest concern shared by the workers surveyed was being able to enjoy their later years (34%).
Nearly a quarter (23%) wanted to keep working because they enjoyed the routine, while one in five (21%) said they enjoyed their job and wanted to continue working.
A third said they were worried their health would deteriorate because they needed to keep working while a quarter (27%) said they needed or wanted to work but were worried their health would make it difficult to do so.
Separate research by Hargreaves Lansdown found that more than a quarter of UK workers do not know what is being paid into their pension.
Over a quarter (26%) of those surveyed did not know how much they and their employer contributed to their pensions.
One fifth (20%) of workers said their total pension contribution (employer and employee) was less than £100 a month. Some 13% of men gave this answer compared to 28% of women.
A fifth (18%) said their total pension contribution was between £101-£200 per month.
• Opinium surveyed 2,000 UK adults on behalf of Canada Life and, separately, 2,000 UK adults on behalf of Hargreaves Lansdown in September.
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