Good argument... I was just pondering as I have an Autumn born only child who never went to nursery (you can see why the question was on my mind!) Not saying it is wrong, just always wondered why if they all been at school for the same length of time there should be any weighting, however small (given that maturity can't really be judged on age alone and that they may have attended preschool)
They didn't used to do that in the good ol' Bucks days did they?
Though surely the one born 31st August starts school a year later than the one born on 1st September, so they are still all getting the same actual years of education and going through the same curriculum.
No...a child born on the 1st September 2015 and a child born on the 31st August 2016 are in the SAME school year. Hence, on the day they start school the 1st September baby will be a whole year (minus a day) older than the August baby. There are a massive number of threads on this topic on this forum alone.
Fundamentally, it any parent is relying on age standardisation to get their child into a GS then frankly that is foolish - the "benefit" is so small that it is almost negligible and, as children are compared with children born in the same period as them, as has been said before ad infinitum, it could be that if the July children, for e.g., do exceptionally well, then in fact they may have to do better than children who are October born, for e.g., if they don't do so well.
As Guest says, premature babies have far more of a fight on their hands in terms of all types of development.