The reviewed research investigated the odds of healthy aging. During the 8 year study, participants were defined as healthy if they did not develop major chronic disease, depressive symptoms, physical or cognitive impairment (Hamer M, et al. 2014).
The conclusion is that significant health benefits were seen even among participants who became physically active relatively late in life.
What is surprising was that compared with inactive participants the ones that were moderate or vigorously active just once a week were healthier, although being active more than once a week was better.
Just get off your couch and start, or encourage your elders to begin.