Sangzhi is several years younger than Duan.

Six years old. According to the brief information of the novel You Can't Hide Secretly, in this novel, Sang Zhi was born in1April 22, 996, and Duan Jia was born in1May 7, 989. The age difference between them is 6 years. Can't Hide Secretly is a novel written by Zhu Ji. It tells the story of an adolescent girl named Sangzhi who met Duan's family who was seven years older than her through her brother's relationship, and fell in love with him in the process of getting along with him, and had a crush on her sweetheart for a long time from youth to growth.