Personally I would give very little weight to the opinion of my 7 year old.
Whereas I personally gave a huge amount of weight to the opinion of my then-7yo.
We were somewhere in between. We knew that DS needed to skip 1st; it just was going to be too hard in the local school to differentiate so much. But at that point, DS was all for the skip. When we moved him mid-year in 2nd to an accelerated program, amounting to a second skip, he had misgivings, but we talked it through and after he visited the school, he was on board too. We let him air his feelings, but then discussed the pros and cons in a way so that he would see that the move was beneficial too. (Boy, that sounds like we tricked him!) All in all, we framed it mainly as a parental decision. DS was 6 at the time the 2nd skip decision was made.
ETA: I wonder if the studies that IAS are based on considered very young HG skippers when they made the rule that no skip should be entertained if the kid is against it. I also tend to agree with CFK that 7 and younger shouldn't be able to have that much control of the educational situation.
