Did you notice that Jin Yong's " Demigods and Semi-Devils " had a mistake?

Mr. Jin Yong's " Tianlong Ba Bu " was one of the famous wuxia novels that was widely read and discussed. However, some people did point out that there were some unreasonable or inaccurate plots in the novel. One of the more famous mistakes was the birth year of Duan Yu and Xu Zhu in the novel. According to the plot of the novel, Duan Yu was born in 1183 and Xuzhu was born in 1160. However, this number did not match the historical year. The year 1183 was the year when the Northern Song Dynasty was destroyed and the year 1160 was the year when the Southern Song Dynasty was established. In addition, the age and experience of some characters in the novel did not conform to historical facts. For example, Duan Zhengchun's age in the novel was around 60 years old, but according to historical records, his real age was much younger than this. Although these mistakes wouldn't affect " Tian Long Ba Bu " as a classic martial arts novel, it would be more interesting for some history lovers or readers interested in history to understand these details.