My great grandmother (dad's side) lived to be 102 and she was in decent health and mentally alert until she died. My mom's mom died at 94, physically she was alright, but she had Alzheimer's. My grandfather (mom's dad) died about 9 months after my grandmother died. He was actually younger, he was around 85 when he died. My dad's mom is 88 now and is not doing well, partly because she seems to think that most healthy foods are bad for her along with all the foods that aren't great for you.