Oh wow, if that is the cut-off, he won't be young AT ALL in K. We have the same cut-offs as you do and I have one late-May, and one late-June and they are both probably some of the best students for their respective grades. In fact, we might be needing acceleration soon. That is red-shirting gone crazy, IMO - just based on your family Hx, I'd almost need my DC to be DELAYED (and I'm not hearing that), to agree to holding-back. JMO.