Do Running and aging mix? Gretchen Reynolds, New York Times health columnist and a runner for many years, has a lengthy and well-researched answer to that question, but the short answer is yes. Writing in the Times, Reynolds cites a 2003 study of people aged 30 to past 70 that found that while sedentary adults lost about 10 percent of their endurance capacity every decade, people who regularly did intense and high-impact exercise lost only about 5 percent of their capacity per decade until age 70. Want another reason? Running and other high-impact activities are beneficial to bone density, Reynolds writes, and there is some evidence that running may improve the health of joint cartilage. Reynolds directs our attention to a 2013 study of adult runners, which showed that they had a lower incidence of knee osteoarthritis and hip replacement than age-matched walker. So, is running good for older people? It’s better than not running. Read more in the New York Times.