[Wahoo73]

Given villain's 3rd street action of just calling your raise and that seat #7 folded an Ace door card in front of villain, I think it is just as likely villain has Aces over as it is that he has trip Aces on 4th street.

I agree with Poor Lawyer...either cap the betting on 4th street to see what villain does on 5th or play 4th street as you did, just make one raise on 5th street, and call down to river. I actually prefer the latter course of action, inasmuch as it would minimize the dent this is going to make in your stack for the rest of the tournament if he does have trip Aces and it will keep villain in the hand all the way to showdown if all he has is Aces over.