My experience with Alzheimer’s is through my mother and her father/my grandpa. I believe there’s was brought on by stress and worry. He was the sole provider of his family of wife and seven children. My mother was mainly a stay-at-home mom for the majority of the time with two children at home and her husband/my dad was an alcoholic so she was stressed and worried. She did not get her driver’s license until she was in her 40s.
So I believe that stress and worry causes it or is a big part of it.