Before the age of 30, impulsiveness was youthful and frivolous. The next sentence is that after the age of 40, a pot of turbid wine broke my heart and I turned around and cried for two lines. The whole sentence means that young people are frivolous and ignorant. When they encounter difficulties, they can only struggle hard, then get drunk alone, and finally look back and cry silently. That young man is not young and frivolous. When he is exhausted, he can only carry it alone. This is to express that you want to travel or feel lonely.