Thirteen is a 1974 Hong Kong coming-of-age film directed by Sung Tsun-shou and produced by Shaw Brothers Studio.

It was based on the novel Zaoshu ("matured early") by Taiwanese novelist Kuo Liang-hui.

[1] Shih Hsin-chiao, a journalist who trained under mentor Lu Tao-jan, is a family friend of the Lus and well-liked by the children.

When Shih returns after a trip to Japan, he finds Chih-pai an attractive young woman.

After repeatedly being rejected by Shih, Chih-pai has a relationship with a rich playboy Hung Sen, which leaves her pregnant.