Level 4 or 5, sat very quiet with 60k (10k above starting stack). Level 4 or 5 (400/800 + 100). Get dealt

in the hi-jack. Raise to 2000. Button, villain, is a presumably a reg, old-school, aggressive (witnessed leading out pot sized bets wherever he's shown pre-flop aggression, shown down TPTK once, other than that not got to show down), raises to 5000. I call.
Is pre-flop ok?
Flop

.
I check and villain lives up to his MO and bets his standard pot ~10000.
WWYD? I called, thinking I'm going to be folding to another PSB, if it comes. Unsure if villain would slow up, given I clearly had something.
Turn is a K - he bets pot again, I shove, he calls.
Before the cards are turned over, everyone at the table are stating (correctly) the villains hand, which is AK, as if it's 100% the only hand he can have. I think the only shock to onlookers is how strong my hand is. At this point I'm thinking I should have been folding the flop. Seems a bit exploitable to just fold on an A, or AA flop though?
Any thoughts, welcomed. My first tournament in a year after a hiatus.