User blog comment:Zolnir/Welcome To Beacon/@comment-10380701-20140801001404/@comment-10380701-20140801002631

She's anything but 17. She's also pretty damn tall, I just noticed.

There's also the possibility that she "started" school late. Like 18 or 19 or so, and thus looks older even when she's just a senior.

But that's a stretchy assumption.