There will be around one pensioner for every two working age people in Scarborough by 2026, according to new figures.
Scarborough will have one of the highest ratios of retirement-age people in England.
According to the main population projections done by the Office for National Statistics, there are currently 28,974 people of pension age in Scarborough and 61,750 of working age.
Economic experts say higher taxes or lower spending will be needed to cope with the costs of the UK’s ageing population.
The ratio, produced by the ONS, takes into account migration from overseas and other parts of the UK, based on trends for the past 10 years.
By 2026, there will be 501 people eligible for a state pension for every 1,000 still working. Previous projections show the current rate is 469.
The new figures take account of the gradual increase in the retirement age introduced by the Government. By 2026 it will reach 67.
David Sturrock, research economist at the Institute for Fiscal Studies, said the ratio provided a useful measure for the pressure an ageing population will place on society.
He said: “We think there needs to be some response to demographic pressures, either through spending reduction, tax rises, or some combination of both.
“Some steps have been made, such as raising the state pension age, but on current trends the ageing population will continue to grow, and it will demand action from politicians.”
Caroline Abrahams, Charity Director at Age UK, said: “Many will be surprised by how much older people contribute to society including a great deal of knowledge, skill and energy.
“Whether they are volunteers, informal carers or paid employees, many are redefining what it means to be ‘an older person’.
And she warned: “Our creaking social care system has been chronically underfunded for years and will simply not be able to cope with the extra demand that an ageing population will bring unless substantial funding is found.
“We also need to create age friendly communities that offer a good quality of life across the generations, by designing environments that are safe and pleasant to live in, with good local facilities and open spaces.
“If we can get this right it will help to sustain the health, well-being and quality of life for everyone, regardless of age.”