Also, the prevalence of dementia was based on a review of either an existing dementia diagnosis or prescription for dementia-related medication, he noted.
"There is no way of knowing about those individuals who did not seek medical attention, did not have access to health care or who were not properly diagnosed," Galvin added. "Nonetheless, the study supports the concept that keeping oneself mentally, physically and socially active over the span of a lifetime may have important effects on both physical and mental health."
The Alzheimer's Association has more about living with Alzheimer's.
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