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.
Types of dementias that progress and aren't reversible include: Alzheimer's disease. In people age 65 and older, Alzheimer's disease is the most common cause of dementia. Although the cause of Alzheimer's disease isn't known, plaques and tangles are often found in the brains of people with Alzheimer's.