In his book The Entrepreneur Roller Coaster: Why Now Is the Time to #Join the Ride, Darren Hardy says
Someone explained “getting a grip” to me another way, calling it the 18-40-65 rule.
When we’re eighteen, we worry endlessly about what people think of us. Does he or she think I’m cute? Do they like me? Is so-and-so made at me? Am I being gossiped about? Then by age forty, we stop worrying about gossip and opinion. We finally stop caring what people think about us.
But it isn’t until age sixty-five that we realize the truth: All this time, nobody has really been thinking about us at all.
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