Description: Neurological disorders have struck millions of people, young and old alike, in the United States, new estimates show. Some 67 per 1,000 elderly Americans now have Alzheimer's disease, up substantially from past estimates, and nearly one out of every 1,000 people have multiple sclerosis (MS), a rate that is about 50 percent higher than earlier estimates. It's not clear if that represents improvements in diagnosis or an actual increase in incidence of MS.