Why 65?

A few snippets of conversations that I have had with Jagger lately:

B: Good morning Jagger! How did you sleep?
J: I've been awake for 65 minutes, you know.
~
B: Jagger, it sounds like you have a yucky cough.
J: Yeah, my throat hurts. I have been coughing for 65 years.
~
J: 65-4 is a super long time.
B: Huh?
~
J: (in the car) I have to go potty!!!!!
B: How long can you hold it?
J: 65 years.
B: I doubt that. We'll pull over as soon as we can. (But even that wasn't soon enough!)