The problem with determining people's age by cultural refs is that we live in an archival era. I have friends in their 20s who quote Lee Van Cleef and Sydney Greenstreet. I myself moon over the likes of Myrna Loy and Edwige Fenech, and quote
Preston Sturges ca. the 40s and
S.J. Perelman interviews from the the 60s.
It's actually more telling to notice the cultural refs someone misses than the ones they know -- particularly in terms of music and fashion. But even then, you've got stubble-chinned tykes whose first duty in life is to be as artificial as possible. (What the second duty is, I leave to your hoary librarian to divulge.)