The provider found that if someone were to retire prior to the incoming state pension age, they would require excess income.
If they wish to retire at age 63, this would be an extra £85,000.
Meanwhile, four in 10 British adults (40 per cent), equivalent to around 13mn people, think they will not be able to retire before the state pension entitlement age.
This rises to 48 per cent if the state pension age rises to 68.
Becky O’Connor, director of public affairs at PensionBee, said: “The government may want to end the Great Retirement, but the truth is that retiring before state pension age is pie in the sky for many.
"The ‘pre-state pension gap’ is the total amount of retirement income someone would need to retire earlier than the state pension entitlement age and maintain a moderate lifestyle.
“Our analysis suggests that is way out of reach for a worker on an average salary and with a typical pot size at age 50.”
O’Connor said the ‘ideal’ retirement age, according to the survey was 60, while the healthy life expectancy age is on average 63 in the UK.
“We used these two ages in our analysis to give an idea of the value of this particular pension gap for people who might want or need to retire at these ages, rather than waiting until they get the state pension,” she said.
The research found that almost one-in-five (18 per cent) said they did not know if they would be able to retire before the state pension age or not.
This is despite widespread agreement among respondents that the ‘ideal’ retirement age is 60, with a third (33 per cent) of respondents choosing this age as the answer to the question: “At what age would you ideally like to retire?”
In addition, the majority of British workers considerably overestimated the typical healthy life expectancy for workers in the UK, with only one in 10 correctly answering that it is between 61 and 65 (approximately 63 according to The Office for National Statistics data).
More than a quarter (26 per cent) vastly overestimated the healthy life expectancy age - which is defined as the number of years a person can live in full health, without disease and/or injury - stating it was between 76 and 80.
The findings come ahead of a government-led review by Baroness Neville-Rolfe that is widely expected to conclude that the state pension entitlement age should rise from 67 to 68 sooner than planned.