Why do people have white hair and humor?

This is a way of self-mockery, and there is nothing wrong with expressing white hair in a joking tone. I don't know when the white hair on my head changed from Liao Rexing Chen to a starry sky. It's starting to have gray hair. This year is really a year when youth has passed away. It's really annoying to have gray hair. The first gray hair in life, all white. Years have left a string of vague memories, gray hair and pale face.