Well, the longest I've ever lived anywhere is two years.
5 seconds sound clip from the Beat the Devil (1953) movie soundboard.
You can hear this line at 00:19:49 in the Blu-ray version of the movie.
Quote context
[...]
- Harry, for instance, is the very best of a type.
- Well, if you must know, I'm a typical rare spirit.
- Well, the longest I've ever lived anywhere is two years.
- No, I, uh, I was an orphan until I was 20, and then a rich and beautiful lady adopted me.
- You know, I've changed my mind about your being an evil doctor.
- You're off to keep a rendezvous some place in Africa sacred to the tribesmen.
- You're going to found a new empire and make yourself master of the riches of the world.
[...]