Hi E.,
That's a tough one... I have two daughters, who both have September birthdays, only a few days into September. The cutoff date was 9/1 in Georgia. Frustrating, huh? My oldest daughter was, like your son, more advanced academically than a lot of the children, so I felt that she might not be getting enough stimulation when she was in the 3 year old preschool class, and she was 4 years old for most of the year. Luckily, she had amazing teachers at the preschool she attended, and they ensured that she was never bored. She is now 9 years old, and I am glad that I didn't push her ahead. Turns out that there are a lot more children closer to her age than I could have imagined. There are also a few children who are even older than she is in her grade (third grade), because of two reasons:
Although the child made the cutoff date, the parents didn't want them to be the youngest children in the class and possibly more emotionally immature than some of the other kids, had they been placed in the older grade - so they kept them with the younger students.
The other reason is because the parents did go ahead and put them in the older grade, and later on, realized that for whatever reason, the child, on some level, wasn't quite as mature as the others, be it emotionally or scholastically. So they had their child repeat a grade.
Now, I understand your situation, because your child is so bright, you feel that you don't have to worry about him ever feeling "behind" on any level. I understand exactly how you feel.
First, let me just tell you, that these days, schools DO NOT ever want to put a child in the grade ahead, if they don't quite make the cutoff date. I have never heard of it happening, but I'm sure it has. They seem to strongly discourage it.
I'm guessing that the reason is because things have a way of balancing out in the end. While your child will mostly likely always be extremely bright, these days school is more intense than it was when we went to elementary/junior/high school. You don't notice it so much in preschool, but by the time they get on up into the elementary grades, you realize that these kids are learning a lot more than we ever did at that age. Many public schools also "teach to the test" to ensure that their schools get good ratings.
Both of my daughters are doing well in the grade behind the grade I would have originally liked for them to be in when they were in preschool.
We moved a while back to a state where the cutoff date is September 30. So technically, they could both be in the higher grade at this point. I'm sure that if I got them tested, I could have them placed in the higher grade if I wanted to - I don't know because I have decided to homeschool them this past year. As a homeschooling family, we have a lot of freedom as to what their curriculum is, and again, I could easily bump up both of them into the next grade and they would do fine.
I choose not to, because, for one, I'm kind of selfish, and want to keep them with me one year longer :) But the real reason, I guess, is because I want to make sure that they are truly getting everything out of their grade that they need to. They both seem to be right in the middle of the age range of the children that attend co-op with them.
What you might want to do, if you still would prefer your son to be in a grade ahead, is wait until you move, then have him tested and admitted in the higher grade. Will he be in Kindergarten when you move? Or will you still be where you are now when you would want him to be entering Kindergarten?
If you could homeschool him for one year for Kindergarten, then he would enter first grade, instead of Kindergarten, when you move. If you are working, this might not be possible, but maybe you could do it during your non-working hours. A lot of work, I know, but I know several full-time working parents who also homeschool. Just a thought...
Good luck with everything. Your son is going to thrive no matter where he is, if he is so bright. The teachers are going to love him! :)