Forgive the snark, my Mother had Alzheimer and it's a horrible experience for all involved but my Father didn't, my Grandparents didn't either. I believe in living healthily and what happens happens.
As do I, and I have seen two Aunts die the slow death of Alzheimer's. It is a f'n horror show, and family caretakers suffer as well. Much more research is needed, and right quick as the population ages.