My grandfather lived to be 98.5 years old and died in his sleep. He was sharp as a tack until his very last day. He was a retired heart surgeon and throughout his lifetime, medicine changed drastically. He told me that when he was in medical school in the 1920's, there was still mention of leeches in the medical books!
He had to change his diet as he got older and medicine got smarter. When he was young, the sign of living prosperously was eating a big steak and a baked potato with butter. As he got older, he would go to Red Lobster and order poached salmon. Even if it weren?t on the menu, he?d get the chef to make it for him.
He also extolled the benefits of oatmeal, being nutritious and economical? but it's hard for me to get into even the gourmet stuff. He also started drinking a lot more water and low carb orange juice.
He also knew that he had to do something for his body and something for his mind every day. He used freeweights. He would read Voltaire in the original French and the Bible in the original Hebrew. He also read three newspapers a day.