Hard hand to fold unless the board is wet. No real scare cards that can come considering you're holding two of the four best cards. Folding AA is something that comes with time. Unless there is four to a straight or four to a flush on board, it can be hard to get away from. I'd advise ALWAYS raising AA and always 3betting it vs a raise. If you are facing a lot of aggression from an unknown or tight opponent, you can lay it down as well. Always try and put your opponent on a specific range. Say you are on the button with AA. UTG +1 raises 2.5x BB. Action folds to you. You 3bet 3.5x the raise. Villain calls. Villains range now consists of pocket pairs and suited broadway connectors(KQs, AQs) with the occasional suited connector(78s, 9Ts). Flop comes Jc Kc 4s. Villain checks. You bet. Villain check raises you all in. What do you do? Villain's range is now KQ, AK, KJ, JJ, 44, and possible flush draws that he is playing aggressively. KK would have most likely 4bet you pre-flop. If you fold here, you are losing money. You are still ahead of all flush draws and all top pairs, and only behind 3
hands, one of which(KJ) you can improve on by hitting another 4. If you are getting Aces all in in spots like these, you are putting your money in good, however you can still lose to flush draws, two pairs, and flopped sets, but the
odds are in your favor.
Basically, never slow play aces(unless you know player tendencies or have a short stack behind you to try and induce an all-in) and bet big enough to give your opponent bad odds to see another card. Be very careful on boards with flushes and straights possible, and always try to put your opponent on a specific range. This is important not just for playing aces, but for every hand you play.