ne in seven Americans over the age of 70 suffers from dementia, according to the first known nationally representative, population-based study to include men and women from all regions of the country.
About 3.4 million people, or 13.9 percent of the population age 71 and older, have some form of dementia, the study found. As expected, the prevalence of dementia increased dramatically with age, from five percent of those aged 71 to 79 to 37.4 percent of those age 90 and older.
About 2.4 million of those with dementia, or 9.7 percent of the population age 71 and older, were found to have Alzheimer's disease, the most common cause of dementia, according to the study.
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