Researchers at Sweden’s Karolinska Institute have just completed a project in which they followed 1,810 men and women aged 75 for up to 18 years. They found that exercise such as swimming, walking and gymnastics could extend life by two years, that maintaining a rich social life added 18 months, and that giving up smoking, even in middle age, made a significant difference. Add it all together and it’s six more years on planet Earth. I’m not surprised. I revealed all this in my book Help Yourself To Live Longer. In fact, I described a combination of ways in which an average person could add 10 years.