I just complted reading the Book "Still Healthy at 100" by John Robbins. In his study of Abkhasia(Longevity Capital of the World),the Okinawans of Japan and some other long-life civilisations of the world (people averaging 80 to 90 years old) he found the secret in 3 areas:
1) Diet - the people consume a natural plant, seed & root-based diet. Meat is consumed to the minimum;
2) Activity - active lifestye - these people exercise regularly to keep their muscles & bodies in shape. For us a morning 30 to 45 mins brisk walk will suffice.
3) Emotion - Relations & Relationships - these people are jovial, friendly, calm, loving disposition, have no anger, hatred, jealousy, etc.
Well, read the book! It is available at our National Library.;