Why is Du Fu called "Lao Du"?

1, Du Fu's mentality is relatively old after he reached middle and old age, and there are often old words in his poems, so later generations call him old by calling himself old. There are many poems by Du Fu claiming to be old, weak and sick, so I won't list them here.

2. Before Du Mu, Shen Chuanshi, a Suzhou calligrapher and poet, began to call him Lao Du, not because of Du Mu, but because of Lao Du, Shen Chuanshi, Deng Di at the end of Zhenyuan, Li Guan, a bachelor of Hanlin and a Chinese calligrapher. In "Pauli Calendar", senior minister You Cheng went out as an observation envoy and resumed his position as assistant minister of the official department. Only if you have it can you use block letters. His poem says:

I told Lao Du seven words, and I told Gao Xuan eight ways. I have been down and out for a long time, so I am very grateful to Yuan Yuan.