people suggesting raise 3-4bb from early, this will only ever ever work if your also raising a few other hands and by the same ammount, otherwise good players will look at your raise and only get involved if they can set up a trap of some kind (set mining) etc etc
now as this is in the tournament section i can add my two cents on the hand
AA is only a pair, yes, and early in the tournament without any info you can safely know that you will only ever win a small pot or lose a big one, so dont try and get stacks in the middle with it, unless your fully aware villain will overplay his TPTK hands (that is extremely situational like many aspects of poker)
but thats early in an MTT, later on players tense up and either 2 things are happening, you have a big stack bully at the table, or you have a passive table
dependant on the table depends on how you carry on playing
if there is a big stack bully, you can start considering how to get stacks in the middle by the turn (all this will depend on how much you need to raise pre)
now if your on a passive table, make a standard 2.2x raise (its my magic figure but midway in the tournament if your raising 3x or more your usually polarising your hand to the top 3 and wont get much action
but again if its a passive table your not likely to get in the stacks by the end of the hand
finally by the time your in 20bb or less,
12-20bb you are hoping somebody raises so you can 3bet them, but by this stage your standard raise should be 2bb and if you have been raising 2bb for all your steals you should also do it with A A
10bb its going in regardless your only move with any hand should be all in, so they will never find out that you have A A and your hoping they have some sort of hand
the final note is, you should know your opponent if you can figure out his betting patterns you can usually figure out when an OverPair is good enough to win you the hand, if you get unlucky then so be it it will happen, but when you know your beat, get out fast lol