A survey has suggested that three-quarters of workers are unaware that the law changes next April to prevent people retiring before the age of 55.
The survey, for the pension firm Aon Consulting, said only a third of those now aged between 45 and 54, and thus most likely to be affected by the change, knew about it.
Only 46% of those questioned knew that the state pension age for women was also going up next April, to 65.
"It is disappointing, but not entirely surprising, that so few people are aware of changes to the minimum retirement age and the state pension age," said a spokesman for Aon Consulting.
"We have seen massive legislative changes to pensions and unprecedented volatility in pension investment: the workforce needs to forward-plan for retirement to understand and respond to these changes and market conditions," they added.