One element of Grayson's Ollie in that book that I didn't like was how weirdly forgetful he was in the present time. As if he had extreme memory loss or amnesia or something. I know he'd come back from the dead and missed a few years, but it seemed a little excessive.
But yeah, I think if Roy was supposed be 16 or so there, Dinah would've been early 20s, maybe?
All in all, I actually like Ollie as a character, even if he is often an unlikable guy. If only because he randomly tells people they're fascists. =)
by summing up in a few dozen pages just what kind of living hell Ollie put Roy through. And through it all, he made it through, and did all right by Lian