[... O....h.... it might be a compliment, but he's pointing out something that makes her feel rather awkward. It does tend to be the first thing people notice about her, that's for sure, so it's not like it's his fault, but... she does hesitate, shuffling in place sheepishly.]

Um. Well... yeah, I'm a little younger than usual, but... I can still do it, don't worry! Things just kind of happened, and I tried to stop a villain who was doing villain-y things but it's not like I caught him and then the headmaster said I could go to Beacon! So I did! But... I'm kind of younger than everyone else which is a little awkward sometimes.

[He definitely didn't ask for your life story, Ruby.]