Not necessarily your favourites or ones you dislike but those that have and haven't aged well.
Yes Minister\Prime Minister is a perfect example of one that has. I love The Thick Of It but it probably won't be as watchable in 30 years time as Yes Minister\Prime Minister.
As a 39 year old I grew up with Only Fools And Horses. Great fun in the 80s but not very funny nowadays.
I remember Seinfeld when it first appeared on BBC2. It had a 9pm slot and then got relegated to after Newsnight as part of a double "headliner" with Larry Sanders. Seinfeld was the best thing during the early 90s and I have great memories of it back then but it unfortunately has aged pretty badly.
Have you guys any suggestions?