On that I agree! I also tried to find a line where Aquila mentions having a son. He does talk about some other man, Artox, having a son named Maestus: "No, he was slain by his own son, Maestus..."
But if it's another line, and you can find/remember it, that would be appreciated! It is probably misappropriated. Aquila is indeed supposed to be young, so you're not quite off when you say he looks 17!
Thanks for the feedback anyways!