I'm only early-20s, but I don't understand Myspace, and I really don't understand Twitter (I can barely figure out how to use this blog). I don't watch Glee, 90210, Mad Men, or Lost. And I definitely haven't seen Avatar or Twilight. I haven't seen any Harry Potter movies either, come to think of it.
This makes me a) not understand E! News anymore because I don't know who the people are. And b) feel about 67 years old.