Based on when I was young, I basically thought of anything from before I was born as “old”. Not consciously, just that everything from “my” decade seemed modern, and everything else was old.

Even now, movies from 20+ years ago look old, even though I remember them being super new when they came out. The Matrix had aged pretty well, but it defintely looks old. I thought LOTR was timeless, but I rewatched it recently and did start to feel it was showing it’s age (but none the worse for it!).