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When you try to act like a grown-up even though you're still a baby inside.
My little brother tried to talk to my mom like she was his boss. He was 10. He looked like he was 60.
My cousin said 'I'm not a kid anymore' when she got a C on her math test. She was 12. She looked like she was 2.
My friend tried to be cool by saying 'I don't need you' to his best friend. He was 11. He looked like he was 1.