This is one of the main reasons I grow and smoke/vape. Years ago I read cannabis may have a prophylactic action on those nerves most susceptible to the disease. I had old relatives get this. Terrible. I do crosswords too. Scary. Maybe I should ingest oil once in a while as a preventative. Scares the shit out of me and I will do anything to prevent it. This is another one of those many, many things we should is NOT accept as a "normal part of aging."