Born invincible was released in theaters in 1978 directed by Joseph Kuo Nam Hung good movie you gotta check out

The film opens with a montage of a youth learning the techniques of T'ai chi. A narration explains the rigors of T'ai chi, and the effects it has on the individuals who learn it. When a person masters T'ai chi, their body becomes impregnable to any weapon, but has a side effect of turning the person's hair white by age thirty and their voices attain a high tone. Students of the Lei Ping Kung Fu school witness two thugs from the Chin Yin Chi clan chase an beating an old man in front of his daughter. The lead student, Ming Tu, interrupts the attack and the thugs use weapons on the students. Ming Tu manages to fight off the duo, but one of his fellow students is mortally wounded. The two thugs warn the students that the Chin Yin Chi clan will be back to kill them. Ming Tu escorts the old man and his daughter back to the Lei Ping school, where the wise master takes them under his protection.