Optimists may have longer lives, according to the results of a long-term study.
Researchers followed nearly 7,000 adults over a period of 40 years, and found that those who were optimistic in their youth, as judged by a standard personality test, had a lower risk of dying during that period.
On average, the most pessimistic study participants were 42 percent more likely to die of any cause.
A number of past studies have also linked optimism to longer life. This could be the result of a number of factors, including a lower incidence of depression and possibly a healthier lifestyle.