My mom passed away on the 24th of Jan. and she had dementia. Her dad had it too. I suspect that I will also be struck down with it as well and I do not look forward to it. In her last days, she wouldn't eat, couldn't remember anything at all and what she did remember was incorrect. I hope I die before I get to that stage. It's a horrible disease and Danbones is right - drinking doesn't have anything to do with it because neither my grandfather or my mom were "drinkers" and they certainly didn't do drugs.
I also keep hearing that one can stave off Alzheimer's and dementia by keeping the brain active such as reading, solving puzzles etc.. That didn't work in either case either; . I'm thinking if it runs in the family, you cannot escape it.