Student A: "One angle of Qing Shui Stone Grouper weighs one jin, a pair of bear paws weighs five qian, one yuan is one liang of gold. The wine in Apricot Blossom Village is the worst, the perfume in Paris is the worst, and the Himalayas are the shortest. Can you tell me my age?"

Student B: "Sixty years old."

Student A: "Why?"

Student B: "Because my uncle is half-foolish and half-silly, and he is only 30 years old."