45s certainly worth playing in that spot. DO NOT raise here. Opening the pot maybe raise, with this many in you're in the perfect spot to limp.

I have no issue really with any of these hands, the AA on the end I think you need to raise a bit more on the turn, either they guy has the draw and you want to make him pay, or he's got a 9 and or PP better than 9 and he may come with you. Either way he's not going to call a big bet on the end with this small of a pot.