You know I suspect, that this question will be asked again in 10 years, in 20 years etc..
In some respects our tastes are formed in our formative years. So for example someone growing up in the 1980's might prefer music from that decade and think some of today's music is manufactued rubbish with the winner of this years X Factor. That isn't to say they will dislike all music from the current era.
It's the same with movies, someone growing up today might find some 80's films cheesy (and some where) but to someone who grew up watching them it can bring back good memories.
So perhaps nostalgia plays a part in it.