Men are 1.5 times more likely to have mild cognitive impairment than women, according to new research.
A study by the Mayo Clinic in Minnesota revealed the "unexpected" correlation and reporting in the journal Neurology the scientists pointed out that the frequency of Alzheimer's is greater in women.
"It warrants further study," said Ronald Peterson, neurologist and director of the Mayo Clinic Alzheimer’s Disease Research Center.
"We're looking at 25 per cent or more of the population aged 70 or older who have dementia or are at risk of developing dementia in the near future," he commented.
The results highlight the need for early diagnosis and therapeutic intervention, Mr Peterson added.
According to the Alzheimer’s Society, Alzheimer's is the most common form of dementia and affects around 465,000 people in the UK.
Read more about Barchester's dementia care homes.