We waited. Now our daughter excels. Is it correlative or coincidence? I don't know but if you look at athletics the average birthday of sports draft picks is early in the year. Essentially being older allowed them to excel at the expense of their peers. Now education isn't as cut throat as sports but education is designed to teach to the average student so if you are below average (and someone has to be) as a result of intellect or age school would be more difficult.
Now if your kid can read real books at 4.5 it probably doesn't matter. They will excel anyways. But on average your child will have an easier time in school if they are older.
You do cost them 1 year of compound interest in their retirement and they can buy beer in Grade 12.
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