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A progressive disease that destroys memory and other important mental functions.
Brain cell connections and the cells themselves degenerate and die, eventually destroying memory and other important mental functions.

The greatest known risk factor for Alzheimer's and other dementias is increasing age, but these disorders are not a normal part of aging. While age increases risk, it is not a direct cause of Alzheimer's. Most individuals with the disease are 65 and older. After age 65, the risk of Alzheimer's doubles every five years.