Hi Tobitax your question is Alzheimer’s / dementia hereditary usually its one the things your Consultant will ask, and unfortunately my dad was diagnosed with Alzheimer’s when was mid seventies although look back the family now think it was more like in his sixties dad knew his memory was bad but he would say he was punch drunk from his younger days when boxing, my Mum, her sister & her brother were all diagnosed with Alzheimer’s in their eighties although none of them were as bad as my dad he had no idea who we were, I was diagnosed at the age 57 I'm almost 67 now ok few problems got to be positive best not to worry