Silver Book Fact
Of those with Alzheimer’s disease, an estimated 4 percent are under age 65, 6 percent are 65 to 74, 44 percent are 75 to 84, and 46 percent are 85 or older.
Alzheimer's Association. 2012 Alzheimer’s Disease Facts and Figures. Alzheimers Dement. 2012; 8(2): 131-68. http://www.alzheimersanddementia.com/article/S1552-5260(12)00032-5/fulltext