AA facing CR on Turn

Since villain is so to say unknown, its mostly playing guessing games.
With his C/R on the Turn his value range contains 22, 33, 55, 88, A4 and maybe 85 suited.
But as you already said, there are tons of draws out there. So he can be doing this with a semibluff or in microstakes even with nothing (Thinking you are bluffing him).
On the River if you call you need to be right 37% of the time.

I would find a call here.

His stats look fishy and not full stacked isn’t a sign of a good player as well. If you think he could semi bluff a lot on the turn I would go for it and shove for value and protection, but most of the time it looks like a made hand and I would even consider folding this hand. He can easy have a set or something.

Cheers,
SDK1987

Without further information, my heart would hurt so much but I would find a fold OTT. Sure there are many draws but:

1) You block both nut flush draws which reduces his semibluff range quite a lot. He does not seem to be such a huge calling station so far and therefore I would narrow down his range a lot.
2) x/r on microstakes, especially on Turn is an extremely strong move in general and I would simply believe him and fold without any solid piece of info that he can do that as a bluff.

But I am curious about what villain had

It is an exploitative fold on the turn.
Mostly c/r is for value only at this limit

You are beat to lots of hands
Sets straights and Twopair holdings