This is a great movie, the director, Joe Dante, also directed The Burbs, both Gremlins movies, Explorers (loved that as a kid), Rock N Roll High School, and The Howling, among other things.
As for Meg Ryan aging, yes she has. The last time I saw her was a few years ago, when she made that boxing movie, where she was a manager or something. I didn't see the movie, but she was a guest on "The Best Damn Sports Show Period" on FOX Sports, and she looked awful. She looked very old, at least compared to how she looks in the movies we all remember her from. I was very shocked watching the interview. But hey, we're all going to age. And she probably looks better than most women her age.