As I grow older, I have no knowledge at all, but I have the burden of jokes. What did my wife mean by her exact words?

Ironically, the scholar is so old that he has no knowledge. "You are old, but you have no knowledge at all, but you are full of jokes." This sentence comes from "Laughing at Guanglinji", which actually means: satirizing the scholar's age and lack of knowledge, but making many jokes. On the surface, it means: age has a handful of firewood, learning has no firewood at all, and jokes have a load of firewood.