"The odds of getting Alzheimer's disease or other
forms of dementia are declining for people who are
more educated and avoiding heart disease, a study
finds. The results suggest that people may have
some control over their risk of dementia.."
http://www.npr.org/sections/health-shots/2016/02/11/466403316/can-dementia-be-prevented-education-may-bolster-brain-against-risk