Hmm...it's been a few years since i watched T2, but I remember still feeling that was a great film to watch. Guess I still need to pull out the blu-ray!
I think with me having watched these films, it was moreso the grainy look of the movie than it was props, wardrobe, hair, etc. But maybe, especially for Field of Dreams, those are elements that would make a movie look old.
Let's touch on music for a moment. Because we watched Ace Ventura: Pet Detective, and while that film had that grainy look of an older movie, we realized the score made the movie sound and feel like an action/comedy movie from the early to mid 90s....the electric drums, the guitar roar, the keys. These tropes make a film less timeless than let's say John William's score to E.T. or Alan Silvestri's Back To The Future. We know that those scores came from the 80's based on movie knowledge, but those scores are timeless that if you listened to them today, it still sounds fresh.