A new study shows a relationship between fast walking and life expectancy. For this study, researchers looked at walking speed and other health factors for almost 35,000 older adults. They followed the participants for up to 20 years. Dr. Stephanie Studenski at the University of Pittsburgh led the study. 'Your walking speed is a reflection of just how well many of your body's systems are doing,' noted Studenski. By timing walking speed and using the longevity charts, doctors can provide better care for their patients. For example, most doctors don't screen patients older than 70 for prostate cancer. But if a man is otherwise healthy and energetic, and expected to live at least 10 more years, he might benefit from the screening. For those who are less healthy, doctors could look for ways to improve their health and quality of life. Dr. Studenski says the charts, while good, however, are not always indicators of longevity. Some people in good health just prefer to walk slowly.