It's true enough that he can move along quietly without being noticed, and he's beginning to actually consider the possibility when Zevran dismisses him as too young, and the offense shows clear on Sam's face.

"If I were older?" he repeats, indignant. He sits up a little straighter, trying to look as tall and mature as possible (to little effect). "You don't need to worry about that. Why it's been five years now since I left my tweens!"