Retirement may increase a man's risk of dying of heart attack. "We found an 80 percent higher rate of death from coronary disease among those in a study who had retired compared with those who had not," said Dr. Charles H. Hennekens of Harvard Medical School. It may be that some people who retire get all nervous about it and kind of tense," said Hennekens. "That may be a way of explaining this, but I just don't know."

Hennekens said he and his colleagues were trying to set up a long-term study of up to 10,000 elderly persons to determine their physical an…