A lon g, healthy life is no accident. It begins with good genes, but it also depends on good habits. If you have a healthy lifestyle, experts say, you may live up to 10 years longer. So what is the secret of a long life? I visited places in the world where many people live to be 100 years old-including Sardinia in Italy and Okinawa in Japan. Sardinians and okinawans live longer, suffer from fewer illnesses, and enjoy long, healthy lives. SARDINIANS First I went to Sardinia, where many people, especially men, live longer than in other parts of the world. Generally, women live longer than men In fact, in America, there are four time as many 100-year-old women as men. However, in Sardinia an equal number of men and women reach 100. The reason is possibly that the men have a stress-free life working in the hills, and the women look after the house and the family money. "I do the work, says Tonino, holding his wife Giovanna around the waist. "My wife does the worrying