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.
Report Abuse. Alzheimer disease is one type of dementia. Dementia is a neurological impairment or disease that can be caused by lots of different things. Memory, cognition, and mood are affected and different types of dementia affect these things differently.lzheimer disease is, in part, caused by the development of things called neurofibrillary tangles in brain cells that edge out what is otherwise supposed to be there. There is a genetic component to Alzheimer disease as well.