Kirrahe didn't miss the nervous picking. Similarities in body language seemed to be pretty common among most species. He wouldn't mention it, there was no need to make this human feel self conscious or something.

"I can only imagine how much of a shock it must have been, arriving here from your time. I'm impressed, you seem to be adapting well. Especially considering- ...Well, I'm actually no good at guessing human ages, but you seem very young."