Wait, what—? [ She stares at him with wide eyes, a little horrified. Sure, he looks around her own age, but maybe kind of younger. He's been to war? ] But you... you don't look old enough.

[ Maybe enough to go through basic training, she might guess? But— to actually... be there? Fighting? ]

A therapist is a kind of health-care professional. They help with, like, emotional and mental problems.