When I get asked about DS being 15, and his peers being 16 and driving when he gets to high school (if he grade skips now) and other social issues that MAY arise then, my response, besides "we'll cross that bridge when we get there", is always about it being a bit easier in high school, not harder. There are more diverse extra curricular activities, classes are mixed (my brother, who was a whole year behind me, and I took Chemistry the same year - I waited to take it my JR year instead of my SO year). I always had kids from all four grades in at least 2 or 3 of my classes each semester. And for us, our son will not be more than a year accelerated, so he won't be THAT much younger.
But I think academically, and to keep kids from being bored and learning bad habits as a result, grade acceleration should be done as early as possible.
