Alzheimer's disease is the most common form of dementia, accounting for as much as 70% of all cases of dementia.
Age is one of the most important risk factors for Alzheimer's disease. The percentage of persons suffering from Alzheimer's disease doubles every 5 years beyond the age of 65.
Women are more likely to develop the disease than men are - in part, because women live longer.
People who have a brother, sister, or parent suffering from Alzheimer's disease have a slightly higher chance of developing the disease. Right now about 3 percent have a proven hereditary link (genetics).
Heredity plays a much larger role in early-onset (before age 65) Alzheimer's. About 500,000 Americans suffer from early onset Alzheimer's. The number is growing.