Depends on your age and matureness level as well, I was in Sixth Form last year so I can relate to them a lot more than an adult could (not saying youre old btw, you could be 18 for all I know )
But I really enjoy it, and its not too far off how me and my friends used to talk.
Oooh, I don't know about that. If something is funny, it's funny regardless of how old you are. There are some scenes in Henry's Cat and Roobard And Custard (the 1970's one) that I still find hilarious.
I enjoyed seasons 1 and 2 of The Inbetweeners, but just found the lastest effort a little tired and waning in writing strength.
I still like Inbetweeners and it deserves in a place in my VAST collection of comedy (which spans Laurel And Hardy, through Hancock and onto the aforementioned "The Thick Of It"), but the writer(s) got lazy with this series, I reckon.
Either that, or the standard of their writing was so high in the first 2 seasons that they made a rod for their own back.
I understand that League Of Gentleman are working on a 4th season, which I'm really looking forward to seeing.