Good teen movies have to do one of two things. One is that they have to be realistic and capture the zeitgeist of the age. The second is that they must mock or be irreverant of the cultural norms of its day. Teen dramas will usually go for the first. Teen comedies will go for he second.
However, because the social norms and taboos of youth culture change so rapidly, teen movies very rarely age well. They can still be interesting from a sociological time capsul perspective but usually won't hit you in the gut like they did to audiences of the day.
IMO, teen dramas tend to hold up better over time than teen comedies because "unpopular boy/girl pines for popular boy/girl" tends to be a universal theme since time immortal. However, losing one's virginity for a guy is a lot less difficult these days than it was in 1980 which makes movies like Porkys seem a bit silly to modern audiences.