Oh, he never grew up. He's...
5 seconds sound clip from the It's a Wonderful Life (1946) movie soundboard.
You can hear this line at 01:49:10 in the Blu-ray version of the movie.
Quote context
[...]
- Every time you hear a bell ring, it means that some angel's just got his wings.
- Look, I think maybe you better not mention getting your wings around here.
- Why? Don't they believe in angels?
- Oh, why should they be surprised when they see one?
- Oh, he never grew up. He's...
- Two hundred and ninety-three, next May.
- That does it. Out, you two pixies! Go through the door or out the window.
- Now, that's another thing. Where do you come off calling me Nick?
- Well, Nick, that's your name.
[...]