Feelin' Groovy and OLD

The thirteen year-old sat in the back-seat and complained about the radio today. Finally, my finger stopped on Mrs. Robinson.
"Seriously? We have to listen to this?"
"It's Simon and Garfunckel," I said.
"The circus people?"
"What? No - the Boxer, Bridge over Troubled Water, Feelin' Groovy. We're listening to this."
"Didn't one of them get mauled by a tiger?"
"I think you mean Siegfried and Roy."
"Oh. Yeah. Maybe."

Why would a teenager care about Simon & Garfunkel? She'd rather listen to Lady Gaga or Rihanna.

Something to think about as I write YA. My frame of reference is very different from my potential readers...