"Lovers Lane" joke

A cop is patrolling Lover's Lane when he sees the strangest thing. A young teenage couple is sitting in a car, the guy in the front and the girl in the back. The guy is reading a magazine and the girl appears to be knitting.

He stops the patrol car and walks over to knock on the young man's window. He rolls the window down.

"Yes officer?"

"I have to ask you, what are you doing?"

"Well sir, I am reading a magazine."

"What about the young lady in the backseat?"

The young man turns to look behind him. "Well, I think she is knitting a pullover sweater."

"How old are you young man?" the officer asks.

"I am 25 Officer."

"And the girl?"

The young man looks at his watch. "Well, she'll be 18 in 11 minutes."