More than a third of British workers feel that they will be unable to do their jobs by the time they are 60, a new study for Hazard magazine shows.
The report concluded that most British employees have no major health impediments that would stop them doing their job, yet poor health is the most common reason for staff to leave a job over the age of 50.
The UK ranked sixth out of European nations when it came to the proportion of workers who felt that they would be fit enough for their jobs after 60, with Germany in the lead with 73.6 per cent of workers confident that they would.
With Britain's workforce rapidly getting older and an increase in state pension age planned, older workers should use new age discrimination benefits to keep their job and avoid being pushed onto benefits, the report claims.
"We are living longer and we are staying healthier longer, so there is no rational reason why we shouldn't be able to survive Britain's workplaces for 50 years or more," said Hazards editor Rory O'Neill.
"But intense, stressful, poorly designed work will exact a cumulative toll, so employer-run and government-supported 'work ability' initiatives need to target workers in middle age, so that the workforce remains skilled up and not worn down."
The report calls for age laws to be used with disability protections to require employers to make necessary adjustments, as well as giving older workers the legal right to request flexible working patterns.