I too live with the less-than-zero assurance that I won't wind up with dementia -- I have one sister with Alzheimer's and another who just passed away from a rare neurological disease, corticobasal syndrome, that included dementia and may even be a variant of Lewey body disease. So I do all the things you do and, as you do, understand that it's no guarantee of anything. Even though, like you, I hope like heck to spare my loved ones . . .