I think I notice it the worse with Cliff. J.R..yes, the hair(or toupee) turned gray, but he didn't really look bad to me..at least, not during the original series. I'm not saying Cliff looked bad, but he seemed to age the fastest, and yes, at times looked a little rough. Clayton really didn't age that much from the time he joined till the end, and that was a long duration, but he was also a little older when we encountered him on Dallas, which I guess can either be good or bad..meaning, we were used to seeing an older man from the start. Outside of Larry's occasional red eyes. I don't really notice anything too drastic with Hagman.