Alzheimer's Disease Alzheimer's disease is the most common form of dementia. Dementia is the loss of intellectual and social abilities severe enough to interfere with daily functioning. It occurs in people with Alzheimer's disease because healthy brain tissue degenerates, causing a decline in memory and mental abilities. More than 4 million Americans have Alzheimer's. It usually develops in those ages 65 or older. This number is expected to triple in the next 20 years as more people live …
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