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What is the life expectancy after Alzheimer's disease is diagnosed?

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Alzheimer's disease typically progresses over a two- to 20-year period, and individuals live an average of eight to 10 years after diagnosis, says Alzheimer's Foundation of America. People who receive an Alzheimer's diagnosis at an earlier age can live longer with the disease, according to the National Institute on Aging.

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Alzheimer's disease progresses in three stages, notes the National Institute on Aging. The early preclinical stage may have no symptoms. Individuals in the second stage exhibit mild cognitive impairment. During the third stage, people with Alzheimer's disease exhibit progressive symptoms of dementia. Patients with Alzheimer's disease typically develop co-morbid conditions, and the most common cause of death for individuals with Alzheimer's is pneumonia, as stated by Alzheimer's Foundation of America.

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