I'm certain age has nothing to do with it. The only thing that determines someone's opinion here is how much they care about accurate AV reproduction, and that's not driven by age, only passion for the content.
I'm more complaining about the automatic 24->60 (or 120 or 240) conversion that's enabled by default on a lot of new TVs. I'm not at all opposed to higher frame rate video, I like it. I've just never watched something on a TV where the 24->60 conversion didn't look significantly worse to me than playback at the native frame rate.
Maybe my unconscious assumption is that people's preferences about the ideal frame rate can change over the years, but that reinterpolating the video to a different frame rate will always look worse than native, regardless of the source and destination frame rates. Maybe this isn't true, but that is my assumption.