Last Sunday was a major milestone in my running history. I ran race #500 for my logs. I had run 140 prior to valve replacement in 1991 and 360 since. That's a bit more than one a month on average over 27+ years. There have been years I did only 3 or 4 and some I did over 30, but never one where I stopped, including before or after OHS. At 70 I can no longer run a continuous 3 miles without stopping to walk now and then, but it was a race and I did finish. I may have run about half the distance.