Two teen girls cold-cocked an elderly man they accused of ogling them as they got hot and heavy on a subway train in Chelsea, police sources told The Post.

The victim, 83, was on a northbound C train when the girls accused him of staring at them as they made out.

In response, the teens made fun of him, according to a source.

But the old timer didn’t take their ribbing quietly.

“Why are you messing with me? I’m not messing with you” he declared, sources said.

When the man got off the subway at 23rd Street and 8th Avenue, the teens followed him, and slugged him, police said.

The victim was treated at the hospital for his injuries. A woman who answered the door at his Upper West Side home said the blows knocked him to the ground, where he hit his head.

“He is doing okay,” she said.

The octogenarian is latest in a string of elderly crime victims in the city. An 81- year old actress was mugged in the lobby of her West Village building last week.