3 Limps
SB calls
Hero checks As7s BB

Flop A55chs
SB checks, Hero checks, others check

Turn Js
SB leads $10
Hero call
Others fold

River 8o
SB leads $20
Hero Folds

SB is an old man, and intuition says he is very loose passive. Haven't played with him much.

I decide to fold because I think he can actually have things like AK, AQ, AJ in range. Will also have alot of 5x for completing SB. Looking back, I like my fold. Anyone disagree?