Not all were underage, but that's what the Pervoids wanted.

I just saw an email to Maxwell from "A," who starts his email saying he was at Balmoral Castle, with the royal Family at their "summer camp," so it is almost certainly Prince Andrew.

In the email, he asks if she has any available "inappropriate friends," and she replied that at the moment, she only had "appropriate friends." Apparently, that was the code for under age or over age girls, implying that she offered access to both.