Two elderly gentlemen were visiting. "I guess you're never too old," the first one boasted.
"Why just yesterday a pretty college girl said she'd be interested in dating me but to be perfectly honest, I don't quite understand it."
"perhaps she likes older men?"
"No, I don't think it's that."
"Well, maybe you remind her of her father."
"No, it's not that either. It's just that she also mentioned something about carbon 14."
