The iguana is around 20 years old, the oldest one I've ever been around. Care has been adequate if not completely optimal. When he closes his mouth, you can still see gums, the mouth does not close so completely that the scales on his upper "lips" (I know they don't really have lips) don't touch the lower lips. At times his mouth appears a little dry and crusty from this. The guns are pink, not red. Is this within the realm of normal for a rather old iguana, or something to be concerned about? As this is not my animal, I won't be taking him into a vet for a routine checkup (don't think he's ever had one), but will fork out the money to be seen for a serious condition. He seems well otherwise, the only other thing that stands out as odd to me is he tends to poop quite near to his food, but this may be because the lowest part of the cage is typically on the cold side.