5,000,000 Alzheimer's Patients in the US Today

This NY Times article is rich with information:

Five million people in the United States have Alzheimer’s disease, according to a study last week by the Alzheimer’s Association. About half, 2.5 million, are at the early stages of the disease, other studies have found, struggling to pass for normal.

There's been a significant increase in better treatment methods for Alzheimer's. Probably one of the biggest areas of research and productization is relating to small devices that the patient can wear such that he/she can be tracked at all times-- including an alert being sent to caregivers if the patient moves out of a "geo-fence" (a "virtual" circle on a map).