You're never too old to learn.
4 seconds sound clip from the The Sin of Harold Diddlebock movie soundboard.
You can hear this line at 00:26:47 in the DVD version of the movie.
Quote context
[...]
- No, I didn't say that at all. It just... Oh, but you wouldn't understand.
- Oh, I never touch it, I never have. It runs in my family not to. The demon rhum.
- I tell you what I'm gonna do. Since you've been so generous and all with me.
- No, I tell you, I have never in my whole life...
- You're never too old to learn.
- You can't teach an old dog new tricks.
- Every dog is entitled to one bite.
[...]