I too am in a similar position. My son is 4 and has always been extremely ahead. We are now trying to figure out what next fall is going to look like for him as far as school is concerned. I'm not sure when to test. We are in Los Angeles and a few of the schools for gifted children require testing for applying, but I'm nervous about putting him (and us) through that. But I don't want to hold him back, either. I appreciate everyone's insights here.