How Old Is She?

A policeman is on night patrol near a local well-known Lovers' Lane parking spot, when he sees a car. The light is on inside and he can see a couple - a young man in the driver's seat reading a computer magazine, and a girl in the back seat calmly knitting. Suspicious, he wanders over the driver's window and knocks.

"Yes, officer?" says the young man, obliginly winding down the window,
"Can I help?"

"What do you think you're doing?" the policeman barks.

"What does it look like?" answers the young man, "I'm reading this magazine."

The cop points at the girl in the back seat. "And what is she doing?" he mutters.

The young man glances over his shoulder.
"I think," he says, "she's knitting a scarf."

Confused, the officer asks, "How old are you, young man?"

"I'm 19," he replies.

"And how old is she?" asked the officer, glancing at the young lady.

The young man looks at his watch.
"Well," he says after a thoughtful pause, "in about twelve minutes she'll be 16".