Well, it depends on other factors like position, stacks, blinds and antes level, et cetera. It is ok to play for example A2s or A9off if you are in position and the situation feels right. Otherwise, AT or AJ can get you in trouble if the situation is not right and you should probably fold. For example, if UTG raises and someone 3bets... stay out with AJ! Now if you are BB, everyone folds and SB limps, you can definitely raise with something that qualifies as A-rag (something like A7off for example)