“The problem with growing up is that once you're grown up, the people who aren't grown up aren't fun anymore.”
“Being grown up isn't half as much fun as growing up.”
“Things certainly aren't the way you imagine them when you're a kid and dreaming big dreams about what your life as a grown-up will look like.”
“If you're referring to yourself as a 'grown-up', then you're still totally a kid. 'Grown ups' call themselves adults”
“Until you're grown-up they send you to reform school. After you're grown-up they send you to the penitentiary.”
“Even in this world of course it is the stupidest children who are most childish and the stupidest grown-ups who are most grown-up.”