I've found that in retouching, especially for older folks, you want to leave some of the wrinkles and imperfections. Without them, the person no longer looks like themselves. In my opinion, you want to make a flattering photo, but not one that goes so far that it could have been taken 40 years ago. I also never quite understand that completely smooth skin look, but I feel like I'm probably in the minority on that one(at least, looking at some of the retouching sites).