The format of the movie is very 30s, meaning a lot of filler, a soundtrack that is similar to that of the period, and the characters are what the 30s thought the ideal male and female is like. It has aged incredibly well, but this is why it can't even compare to some of the other films in the canon. The structure is very different than structures in movies today. The animation also has not aged well at all.

I guess because it isn't based on a classic fairytale. It's still very timeless though. This was sooo hard to choose.

I know Beauty and the Beast will win this being the Tale as Old as Time. But it and TLM movie get old after a couple of times, you can tell what's going to happen next. I think a timeless film should be one that you can watch over and over again yet still be shocked every now and again.

The animation hasn't aged very well, and the character's voiced have aged too. I can barely even understand Grumpy

Only because of Snow's voice- I honestly don't know how I'll pick after this

I don't get the story line.

^ That does not have any thing to do with it aging well or not.

This or TLM disney should make more timeless ones

What Jayden-G said

Not a very interesting film. Aurora and Phillip aren't really the main characters, although the whole story revolves around them.

Snow White is very 30th and TLM is very 80th, so they should go next. I was first inclined to pick TLM, just because, well, Snow White is 75 years old and still works fine, but I think the 30th style is very obvious, while TLM is more Disney style with some telling elements (like the hair and the puffy sleeves).
Oh, and considering how old this one really is, it has aged VERY well. Just compare it with movies made around the same time. It's also less the animation which aged in a sense that is says "oh, the gimmick of the 30th", it's more that Disney has learned so much since them. Really, if not for the obvious 30th style hair and make-up, I wouldn't have picked it at all.