Surely any film that is set squarely in a specific period i.e. The Full Monty won't age because they accurately reflect the period they are set in. It's like saying any historic film 'ages'. Film that age worst are 'Sci Fi' where they try to make things look futuristic but a few years later they look very old. 2010 is a good example. Roy Schneider uses a 'laptop' at one stage. I'm sure at the time it had the 'wow' factor, but today it looks soooo old!