I think this is why it's unhelpful to suggest that dementia could be prevented by learning a language or instrument, or doing crosswords. By extension it implies that those blighted by this cruel disease have somehow only themselves to blame. As if dementia wasn't **** enough! I firmly believe my Mum's dementia (she has a non specific dementia, not Alzheimer's) is due to delirium. She broke her hip, had delirium and within 8 weeks went from competent and capable , to unable to live independently. This article " https://www.cam.ac.uk/research/news...ing-new-dementia-eight-fold-in-older-patients" seems to suggest that it is a distinct possibility.Yes of course. I have tracked down the anthropologist I mentioned. If you google margaret lock 2014 the Alzheimer’s conundrum u tube you can see her interviewed, it’s tough and a very different perspective. Well worth a look. It’s not that using the brain wears it out, just some brains are kind of predestined to go early.