Really helpful, all, especially taking the time to find specific listings!
I do think 23" is going to be big - they list standover height at 32.5", and even though he's got long legs, I do want grandkids someday, so that may be out. This is too bad because that Fuji looks *great*.
I will try CL for a 21-22" perhaps (I wouldn't have known the size to look for in an older bike, either, so thanks for that too).