My dad died at 84 and had no signs of any dementia. He was a reader, very physically active, good diet, etc.
My mom passed at 86 after showing signs of dementia since her late 70’s. She was able to function pretty well until the last year or so. She was an avid reader, but little interest in puzzles/games, etc. She was not physically active and became progressively more introverted as she aged.
So I have no idea what that means for me. I am not a person who believes that genetics control everything so I do my best with puzzles/games (which I enjoy), reading, good diet, exercise, socializing, etc.I control what I can.