Which poem of Du Fu was written in the so-called kaiyuan flourishing age?

Du Fu's three poems were written in different historical periods: Wang Yue was written in the so-called Kaiyuan Shi Sheng, when the poet was only twenty-four or five years old. The poem enthusiastically praised the majestic momentum and magical and beautiful scenery of Mount Tai, and also revealed the poet's lofty aspirations in his early years, which has always been hailed as a famous piece of singing Mount Tai. "Wang Chun" and "Li Shihao" were written in the early period of An Shi Rebellion, expressing the poet's concern and sympathy for the country and people's life.