I don’t really like the age/birth year/generation argument. As one factor, sure. But as the defining factor, not really.

My birth year is closer to 1999 than to 1977, and yet while I kinda liked TPM in theaters as a kid, I greatly disliked RotS the first time I saw it (and that was when I still appreciated RotJ). If age/generation is a huge factor here, I should probably be more inclined to enjoy the PT, or at least to be more forgiving of it, since I should be more familiar and prone to liking modern, more impressive blockbusters than older people, and yet that hasn’t been the case (and I’m sure many other people around my age are like me, so it’s not like I’m a demigod or a superior being, LOL). I was already familiar with the OT when I watched RotS, though, but I didn’t love TPM as much as the OT, or I probably disliked it by 2005 (I don’t remember when it was the first time I watched the movie since the only time I saw it in theaters).

Additional factors may be parents, friends, exposure to other movies, etc.