a. They eat a lot of fruit and vegetables, do regular exercise, don't smoke and drink only in moderation. b. Finally, people who live to 100 often have a close family, too. c. It is clear that people who live the longest are health-conscious. d. Therefore, there's no secret - it's just a healthy lifestyle and a positive attitude to life. e. They also tend to be happy and have a good sense of humour.