Who would have linked being grumpy and longevity together. According to a research from the University of Erlangen-Nuremburg in Germany, grumpy old men and women may live longer. Scientists examined data on expected and current future life satisfaction that was collected over a 10 year period from nearly 40,000 people. They discovered that people who have low expectations for their future happiness experience less disability and die later than those who tended to overestimate their future happiness. The implications are that people who are more pessimistic about their future, may take more safety and health precautions. So perhaps the factor is being pessimistic, or better yet, more realistic than grumpy.