I though if you did it on pavement it wasn’t as good
Not to highjack the thread, but like FewsOrange indicates, there is a growing body of evidence that long-term running is perhaps good for the knees. Plenty of evidence the other way when studying people, often former athletes, that start running again after a lay off of a decade or more. Jury is still out.
As to pavement, pea gravel trails and asphalt are noticeably “softer.” But, even on concrete, I find that an smooth even surface helps with a soft foot plant. I’m 69 and have had plenty of injuries from other sports, but never knee problems from running. For reference, I run only about 500 miles per year these days.