Well I have had my SNES since I was in kindergarden (I'm in 8th grade now) and I have to say that it has yellowed very *slightly*. I HAVE had it in the sun but not TOO much, normally its in a black box with tinted windows (my entertainment center) and I also *highly* doubt the air content has anything to do with it. I have bought 2 or 3 used games and they either have the front or back yellowed from what i am proposing is the direction which they were facing the sun. I think its just like fading, except its yellow instead of faded lol!
