An estimated half of all Americans over 85 years of age may have Alzheimer's disease. People with this condition typically show signs of memory loss, confusion, and impaired judgment. Other symptoms can include restlessness, a deterioration of language skills, and mood swings.
The brain tissue of someone with Alzheimer's disease often contains abnormal protein clumps and tangled bundles of fibers. However, the exact reasons why these abnormalities occur are still unknown. While age appears to be the most important risk factor, research scientists are also studying the role of genetics in the development of the disease. People with Alzheimer's typically live for 8 to 10 years after they are diagnosed.
(Click Alzheimer's Disease for more information, including the specific parts of the brain that are affected and why the disease's early signs are often missed. You can also click any of the links in the box to the right for specific information.)
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