I'm 44, and have a friend who's ten years younger. He likes TNG era onwards and most of the movies. Once when watching a TOS episode at my place he commented on the "fake looking planet set", which made it difficult for him to get into the show. I said nothing, but I was inwardly smiling and thinking "point: missed"! It's a damn shame, but this kind of reaction to the "look" and production design of TOS may well cut many out of the loop almost before they begin.