What song is it about me gradually losing my temper at this age?

This lyric comes from the song "A Lifetime in a Flash".

Excerpts from the lyrics of "A Lifetime in a Flash": At this age, I gradually smooth my temper, know how to control my emotions, and see clearly the worldly affairs. Dreams are lost to reality, childhood is lost to papers, young people are full of money, and middle-aged people surround me. My child, people live a lifetime and strive to live a good life. You have to eat all the ups and downs to make life interesting.

The song "A Flash of Life" was written by Sang Ai and composed by Qin Ziwen. The song as a whole expresses the artistic conception that when people reach a certain age, they will gradually become peaceful and temperate.