[levAA]

7/0 means he played 2 hands from the last 30 - this is usually a tight player but i would be carefull - bad streaks are often 30 hands or longer, so be somehow careful with your read. with the 0 this can also mean he completed 2 times the SB.

so i would say tight yes, passive not necessarily.

Preflop: i think limping is ok, while i always prefer raising here as you get a better idea where you stand.

Flop: I think your first concern should be UTG! what kind of hands limp from UTG and then bet into 4 opponents with this flop? maybe Ax suited lower than AJ, or a complete donk with a medium PP? Maybe AQ or a slowplayed AA - still i think calling is the right decision here.

After the push from BB everything gets much more easy. UTG folds (think this was a very donkish play) and you have to decide if your AJ is good now.

If BB playes a better Ace AK, AQ he def. should have raised preflop being out of position. Overbetting the pot usually means a weak ace or something like KQ.

I think your AJ is good here.