I think most sitcoms age poorly, but Seinfeld is timeless.
Agree (that most sitcoms age poorly) and disagree (that Seinfeld is timeless - it's not to me).
The sitcom that is timeless for me is the Bristish "Black Books". That one is hilarious every time I watch it, and I have rewatched it several times. One of the things that makes it great for me is the whole setting. Some sitcoms are just vehicles for telling jokes. But with BB it is - for lack of words - a total experience. If that makes sense. I tend to think that this is a typical difference between British and American comedy, which is why I tend to prefer the British.
But I may be wrong. I think that Seinfeld, the show about nothing, is similar to BB in this respect. Come to think of it, maybe Seinfeld will be timeless to me - maybe I should rewatch a couple of shows (if I can find them),
One thing that puzzles me a bit: When I was a kid, nearly 60 years ago, I really liked oldish (B&W) comedy like Chaplin movies (the short ones) and Laurel and Hardy. I spent a lot of time ROFLing back then.
Now, I have watched some of them as an adult, and while I do find them amusing, they're not nearly ROFL worthy. I wonder why, Maybe they actually weren't as funny as I thought. There weren't many comedies back then (at least not broadcasted on our sole TV-channel), now there are a lot of competitors. Or maybe I have changed. Probably to some degree the latter. I very seldomly leave my chair when laughing these days (even when watching Bloack Books), and when I do, it's usually to get another cup of coffee from the kitchen.
pibbuR who maybe has become more cynical
PS. I think comedy is a difficult genre. There are a lot of mildly amusing ones, and the really funny ones are far between. Which means I have to watch (or start watching) a lot of mediocrity to catch the really good ones. It's not only comedy, of course, same problem with horror. And (real) football matches DS.