Zhè wèi huángdì de dúzǐ nián jǐn wǔ suì jiù dēngjī le.
This emperor's only son ascended the throne at just five years old.
Tips
culture
In traditional Chinese culture, having a son — and especially an only son — to carry on the family name was considered crucial. 独子 often carries connotations of both great parental hope and significant pressure on the child.