AlzheimerThe most common form of dementia among older people is Alzheimer’s disease in which there is neurodegeneration leads to memory loss. About 4.5 million Americans suffer from this condition, which usually begins after age 60.The Brain and Alzheimer's DiseaseAbnormalities found in the brains of people with Alzheimer's disease include:Neurofibrillary tangles, twisted structures formed from part of the nerve.Beta amyloid, a sticky substance that clumps to form structures called plaques. Plaq...