Proceedings of the National Academy of Sciences"The reasons for the decline in the prevalence of dementia are not certain, but this trend is good news for older Americans and the systems that support them," said Péter Hudomiet, the study's lead author and an economist at RAND, a nonprofit research organization."This decline may help reduce the expected strain on families, nursing homes and otherMichael D. Hurd and Susann Rohwedder of RAND are co-authors of the study.
In 2021, about 6.2 million U.S. adults aged 65 or older lived with dementia. Because age is the strongest risk factor for dementia, it has been predicted that increasing life expectancies will substantially increase the prevalence of Alzheimer's disease and related dementias from about 50 million to 150 million worldwide by 2050.
The new RAND study employs a novel model to assess cognitive status based on a broad set of cognitive measures elicited from more than 21,000 people who participate in the national Health and Retirement Study, a large population-representative survey that has been fielded for more than two decades. The RAND study found that education was an important factor that contributed, in a statistical sense, to the reduction in dementia, explaining about 40% of the reduction in dementia prevalence among men and 20% of the reduction among women.
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