There is absolutely no correlation between arthritic aging changes and pain. Arthritis limits mobility, but does not "cause" pain (although the structural anomaly may 'trigger' it). Arthritis is one issue, pain is quite another
This is absolute baloney. Tissue becomes inflamed around the arthritic joint and to the afflicted one becomes indistinguishable from the other. It is true some people have osteoarthritis limiting motion or strength without accompanying pain (my mother did after an accident, at an old age), but one should not generalize.