In 2000, there were an estimated 411,000 new cases of Alzheimer's disease. By 2010, that number is expected to increase to nearly half a million new cases each year (454,000), and by 2050, there will be nearly a million new cases annually (959,000).
Hebert, Liesi E., Laurel A. Beckett, Paul A. Scherr, and Denis A. Evans. 2001. 'Annual Incidence of Alzheimer Disease in the United States Projected to the Years 2000 through 2050'.