NIH MedlinePlus the Magazine, Understanding Alzheimer’s…
What Is Alzheimer’s Disease (AD)?
Dementia (de-MEN-shuh) is a brain disorder that seriously affects a person’s ability to carry out daily activities. The most common form of dementia among older people is Alzheimer’s disease, which initially involves the parts of the brain that control thought, memory, and language. Although scientists are learning more every day, they still do not know what causes AD, and there is no cure.
As many as five million Americans suffer from AD. The disease usually begins after age 60, and risk goes up with age. Younger people may get the disease, but that is much less common. About five percent of men and women ages 65 to 74 have Alzheimer’s, and nearly half of those age 85 and older may have it. But Alzheimer’s disease is not a normal part of aging, and it progresses differently from person to person. Although it may last as long as 20 years, most Alzheimer’s patients live from 8 to 10 years after diagnosis.
See on www.nlm.nih.gov