Professors at the University of Pennsylvania recently developed a life expectancy calculator. You answer a bunch of questions about your age, fitness and lifestyle and they tell you how long you will live.

I put in my details. Thirty-five, female, high income, excellent health, good physical fitness, non-smoker, single. The results come up. Life expectancy: not as high as you might think. And the major impacting factor? Being single. Apparently married people just live longer.