Peter gives her a curious look at the mention of the age difference between her and her husband. Was she like, married to a super old man? Peter supposes once you reach a certain age it's probably not that big of a deal.

"Yeah," Peter says. "It is. Um. So, history. We should probably decide what we're going to start with." He glances at the blue book before returning his gaze back to the professor's face. "Did you have something in mind?"