How old is the movie?

Overview

A plainclothes policeman, Chin Tai Ba, is seriously wounded in a fight with some ruffians but is helped to safety by a young wiseguy, Cub. Here he is taught the art of Sleeping Fist by Cub's master Chung Yiu, and the trio march to the Shang Wei martial arts school to take revenge on the thugs. However, in a last desperate attempt to get even, the gang call on Eagle Claw master Kao to sort out the snoozers.