Silver Book Fact
Close to half of all people over the age of 85 have Alzheimer’s disease (43%).
Alzheimer's Association. 2011 Alzheimer’s Disease Facts and Figures. Alzheimers Dement. 2011; 7(2): 208-44. http://www.alzheimersanddementia.com/article/S1552-5260(11)00036-7/fulltext