Yu Xin's life is the most miserable. His poems in his later years caused a sensation in the rivers and lakes, which began with Du Fu's Five Poems about Love (I) in the Tang Dynasty. In his prime, the poet had a smooth career, with lofty political aspirations and broad mind. However, he suffered many setbacks in his later years. After being forced to leave Beijing in the first year of Tianbao, he lost contact with the imperial court and lived in seclusion in the southeast for a long time. In this case, he wrote many poems to express his dissatisfaction with the old country in the north and the real politics, among which "the feeling of life experience" is an important content.
Sighing that you are confused in your poor years, making friends with the old and dying, comes from Su Shi's "Er Sheng Yun Jiang Yingshu", which expresses that in your twilight years, your career is difficult to achieve, your ambition is unpaid, and your life is down and out.