How old is your newspaper?
A substitution for ' You are sooo~ left out.", to tell someone that what they were saying was old news.
Henry: "Hey, I heard Mark is going out with Cathy. Is it real?"
Rick: "Dude. How old is your newspaper? That's 3 months ago. He's going out with his side chick Sabrina now."
Rick: "Dude. How old is your newspaper? That's 3 months ago. He's going out with his side chick Sabrina now."