“Here are some important stats that you need to know: In 2006 estimated that 220,000-640,000 Americans suffer from early onset dementia. But according to The Mayo Clinic, there are explicit reasons for this glaringly huge phenomenon – I was surprised to find that the research indicates a large number of reported cases are from “co-morbid” diseases that include multiple sclerosis, Huntington’s disease, lupus or HIV.