Is it possible folks don’t live long enough to exhibit Alzheimer’s ergo the low incidence? Or is it just not diagnosed as such? Many western nations show higher incidences with longer lifespans. Would attention deficit disorder be prevalent in, Nepal for example?
Some very interesting breakdowns of incidence of diseases by regions here. http://www.worldlifeexpectancy.com/world-health-rankings
Take a look at the last nation on the list for Alzheimer’s. It is Monaco. They are a first world country and good life expectancy, but yet last on the list. Why?