A historian challenges a labor-history fable. Timothy Messer-Kruse doesnât remember her name, but the question she asked in his college classroom a dozen years ago changed his career â and now it may revolutionize everything historians thought they knew about a hallowed event in the imagination of the American Left.
Though the effects of the disease are similar, there are two main types. 1  Early-onset Alzheimer's. This type happens to people who are younger than age 65. 2  Late-onset Alzheimer's. This is the most common form of the disease, which happens to people age 65 and older.
Causes of Alzheimer's disease. Alzheimer's disease is the most common form of dementia. In Alzheimer's, the loss of brain cells leads to the brain shrinking. Part of the brain known as the cerebral cortex is particularly affected by this shrinkage. The cerebral cortex is the layer of grey matter covering the brain.