My grandmother was diagnosed with dementia with Lewy bodies about two years ago. Watching the disease progress, I’ve started wondering: to what extent is dementia hereditary? This link states (in reference do DLB)
As far as I know, no-one else on my father’s side has been diagnosed with dementia, but then again, those diagnoses probably wouldn’t go too far back into history anyway. Women on both sides of my family have been traditionally long-lived; when I get old and gray, will I have to worry about dementia in addition to arthritis and excessive hair loss? In general, how much do doctors and scientists know about the hereditary nature of diseases like dementia?