And, potentially, mental health - though the variance between people is huge. While my grandfather (mother's side) was mentally as sharp as he'd ever been when

And, potentially, mental health - though the variance between people is huge. While my grandfather (mother's side) was mentally as sharp as he'd ever been when he died at 92 and my 94 year old grandmother (father's side) still plays bridge several times a week and has a fantastic memory for everything related to the family, it's also all too easy to find people who have been afflicted with dementia and alzheimer's from their 70s and 80s.