At your age, you ought to know that there aren't any ghosts.
2 seconds sound clip from the Phantom of the Opera (1943) movie soundboard.
You can hear this line at 00:31:18.945 in the Blu-ray version of the movie.
Quote context
[...]
- She should have been dismissed long ago.
- That's not all. The thief has broken into the restaurant.
- Call the police at once. This must be stopped!
- Monsieur, I'm afraid the police can't stop that.
- It's he.
- Who?
- Oh, please, don't start that nonsense again, Vercheres.
- At your age, you ought to know that there aren't any ghosts.
- Monsieur, you are skeptical, but I don't like ghosts. I'm a busy man.
- It has a long nose and a big red beard.
[...]