The number of people aged over 80 in the UK will have doubled by 2020, according to government figures.
Governments around the world are considering how best to prepare for ageing populations, the Financial Times reports.
It says the authorities face a dilemma in working out what proportion of elderly people will need care in residential and nursing home environments.
Gordon Butterworth, an analyst at Merrill Lynch, comments that "there will be a change in the mix" as a result of the increasing numbers of over-85s, according to the news provider.
He adds: "There will be more people in need of 24-hour care - those with dementia and Parkinson's."
The deputy manager of the Barchester Threshfield Court care home recently told the Guardian newspaper that the home provides a "stimulating and home-like" environment for residents with dementia.
Liz Bedford said staff have been able to create a "specialist hub" for people living with the condition.
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