Nearly adult size. Either a hybrid or a regional variant as he doesn't have the shock of white behind the gills/chin that a lot of PBTs have.
Those pics are kind of old, he's a bit bigger now, and has gained quite a bit of weight weight. Loves to eat clams, nori, and most kinds of frozen food. Definitely will become the kind of the tank.
If you've got some sweet SPS frags I don't have, I'd happily trade. But if you've got a tank over 100 gallons AND you prophylactically quarantine your fish and know your tank is ich free, I'll just give him to you.