Figures reveal Cumbria's ageing population
Health chiefs are forecasting the number of people living until 85 in Cumbria will more than double by 2033.
NHS Cumbria said population projections showed those aged 85 would rise from 27,000 in 2010 to 59,000 in 2033.
That would represent one in 10 of the county's population and health chiefs said it would require a change of focus for health services.
Professor John Ashton, director of public health, urged people to take steps to improve their health.
He said specialist community nursing teams, a greater role for community hospitals and more health services closer to where people lived would be important.
"This requires a change of emphasis for health services towards health protection and health promotion and recognition that individuals, families and employers have a responsibility to make the most of what we've got," he said.