PBA: But a good teacher makes sure the kids understand. If the older kids are actually smarter, then they’ll naturally move ahead more quickly- unless you’ll want them to artificially stop.
You have also not presented an iota of proof that a few months’ difference really makes a kid smarter.
All I can say is that in my elementary school class, the valedictorian was born in October (younger end) and the salutatorians were born in December (older end) and August. (None of them were me, btw.)
Are there statistics that show that kids born in the later months actually perform at a lower level than older kids? I’ve never seen it, and while I’d say that Gladwell’s not a great source because he cherry-picks, I don’t seem to remember him even mentioning a classroom component in Outliers.