9 Steps to Reverse Dementia and Memory Loss as You Age: "Dementia is a big problem and growing every day. Ten percent of 65-year olds, 25 percent of 75-year olds, and 50 percent of 85-year olds will get Alzheimer's disease -- at a cost of $60 billion a year to society. Worse, the number of people with Alzheimer's is predicted to triple in the next few decades. It is now the seventh leading cause of death.(i)"