I'm 34 or so.
In my lifetime, the only film in theaters I recall being NC-17 was Showgirls. And, that came out when I was around 11. And, being a Saved by The Bell fan, when I finally saw the film, I was like "Oh, no, Jessie Spano, what are you doing?"
And I was like, "Jessie Spano, you've finally found your true calling!"