Yeah, we don't know his precise age, but if we do the math (Pandora had him when she was 156, Pandora has been older than 300 for at least a few centuries) at the absolute youngest he'd still be pushing 400, and he could be quite a lot older than that.
I lean Noriko as "if it's someone we've heard of, it's her" but true that it could easily be a new character