Can I get a K to fold here with a 50raise? 60? Even if he has an A, his aces are weaker than the ones i can have, right? Full pot? Or am I just go greedy? Villain is a thinking agressive player. (relatively speaking)

its really risky, you have no idea what he has.. dont think he has too many kings in his VB range here. more Ax+ typ hands etc..
ofc you can try to take the pot away, but I think he will call with a lot of Ax hands since you wont raise with too wide a range here. you do it with A7/A4/ AT but not much more for value (and sometimes QJ if you manage to have that). In return you can raise with 65 and a lot of random crap. (Most of your Ax typ hands you think are "stronger" then his will just call his bet (like A9, AJ) so its unlikely you will raise those)
As long as you think he can fold an Ax go ahead, but I am not so shure.. and if you are raising.. do it to some amount he can fold to. Like 70+ or something

I feel like this is one of those "he knows I will bluff the ace alot"-situations. Problem is that I dont know what to do, but I really looks like he is in some way feeling if his Kx is good here, but maybe villain isnt smart enough to know that if im empty here I'll always bet the ace.
But if he is, doesnt that mean that I can take away all his aces here (except 2pair)? Meh, I'll just wait for a read and adapt after instead. Too early in the morning to think straight.

I actually dont understand all the fuss about this hand. you have a pair of nines, CB the flop, he calls and you give up the hand. when he VB the river you want to bluff and stuff. why not just fold and take the next hand?
even if you play this hand perfectly this is a very marginal spot... there are no ways you can win a lot of money here. There are so many situations you could win a lot of money in if you analyze those hands and improve those situations.

I'd rather call then raise. I think his range is more nutted then yours.

Then I guess its a fold, because im never calling here. And I dont get why I should "fold and take the next hand either", but I see your point. Though I wasnt sure it would be a marginal spot before you wrote it.