I am wondering if any mental illness or serious mental issues in one's earlier/current life can have impact on getting dementia? I heard that autism can have some impact on getting Alzheimer's since the brain is not normal. Of course a mild depression or a little worry here or there would not cause dementia. But what about for some people who have serious issues like aspergers and etc.? e.g., for someone who has problems getting along with families or people. I know some researchers tried to study anxiety and depression vs dementia. I know alcohol is one factor for sure.