My mom stayed fit and walked everywhere, and was a teacher and curious lifelong learner& traveler sort of person and still got dementia before she died. Her mom too. Honestly it terrifies me but there is only so much you can control. I do work out and stay fit and so far so good, I honestly feel great. My hope is that science comes through with a good treatment, and between me & my husband we have a lot of children to hopefully help some if we need it.