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.
The most common gene associated with late-onset Alzheimer's disease is called apolipoprotein E (APOE). APOE has three common forms: 1  APOE e2 â the least common â appears to reduce the risk of Alzheimer's. 2  APOE e4 â a little more common â appears to increase the risk of Alzheimer's.