Gait And Lifespan

"What are you reading? ", asked the Octopus. "Oh, about a hackneyed old idea that rises as a new medical discovery. The walking speed of old people can predict their lifespan." "Are you serious? " "I just read it in The Journal of American Medicine." "But how can walk speed predict lifespan? " " Well, the idea is quite simple. Gait speed is a reliable indicator of overall health and longevity for the elderly. Walking speed is a marker of vitality and can forecast longevity. A geriatrist can measure an older person's likelihood of living 5 or 10 more years." "Quite amazing", said the Octopus. "Yes. indeed", agreed the Porcupine. "People with average life expectancy walk about 0.8 meter per second."