" 18–40–60 rule. It says that when you are eighteen, you worry about what everyone thinks of you; when you are forty, you don’t give a damn what anyone thinks about you; and when you’re sixty, you realize no one has been thinking about you at all. "

― Daniel G. Amen , Change Your Brain, Change Your Life: The Breakthrough Program for Conquering Anxiety, Depression, Obsessiveness, Anger, and Impulsiveness