'You're assuming I'm interested in finding out?'

He half-shrugs.

'You're very old, so logically you know things I never will. The way I see it, that just makes me more impressive.'

But that has little to do with sex, which is what he was talking about at first.

'And there'd be little point hiding it if you had a way with numbers, though I expect you hide everything as a matter of course.'