I'm 37.
3 seconds sound clip from the Monty Python and the Holy Grail movie soundboard.
You can hear this line at 00:09:16 in the Blu-ray version of the movie.
Quote context
[...]
- Not at all. See you on Thursday.
- Right.
- I don't know. Must be a king.
- Why?
- He hasn't got shit all over him.
- Man!
- What knight lives in that castle over there?
- I'm 37.
- I didn't know you were called Dennis.
[...]