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I just think it's reasonable that if my son was ready to start K at age 4 (which he did) then some children may not be ready until 6. It's the variability of life.

This is precisely why I have an issue with cutoff dates to begin with. If a parent is able to keep his/her child out of school an extra year, then a parent should be able to enroll his/her child a year earlier. I'm ok with a testing process for the latter, or something, but it still shouldn't be a door slammed in a parent's face (which it is here in GA) for even questioning it. Physical age should not be the only thing that determines when one starts school.