If your getting the pot odds to call preflop, then do it.

However knowing he has AA for sure, is kinda hard. I mean put him on JJ-AA yeah, but just AA from 1 bet is kindahard.

Also implied odds are the amount of money you can realistically expect to be added to the pot to increase your pot odds. So if your getting 3.5-1 to call, and you fully believe he will stack off if you hit, then it shoots to 9.5-1.

That kinda thing