A snip-it of conversation from Easter dinner...
Memmere (my grandmother): Well, I'm going to be 77 in June.
Devin (with a genuine look of surprise): You've got to be kidding me!
It was so funny that we all busted out laughing!! I really don't think that Devin understands the concept of age (well, actually he does- to a point) or what 77 years old actually means. I think it was just an appropriate/well timed/ testing out the waters kind of reaction.