Conversation while at border station

Old man: So, what is it you do for a livin'?
Me : I was a paleontology student at the University of Alberta, but now I'll be working as an assistant in their museum collections.
Old man: Oh, so you look at dinosaurs, eh?
Me: Yeah, sort of.
Old man: My grand neice used to do that. Yeah, that was back in . . .
(five minutes later)
. . . But what I alway had a problem with was that ten thosand year stuff.
Me: Well, no scientists say ten thousand years for fossils.
Old Man : Oh? How old are they then?
Me: Any dinosaur fossil you see would be at least 65 million years old.
Old Man : What!? That's even worse! How old do they think the earth is then?
Me: Oh, about four and a half billion.