BS about brains

Consider:

Valor: When an Enemy Was a Friend | Air & Space Forces Magazine https://share.google/QXOyPashrtvKSPDop

or

https://en.wikipedia.org/wiki/Charlie_Brown_and_Franz_Stigler_incident?wprov=sfla1

Charlie Brown was 21 when he flew that mission.

He was entrusted with very large responsibilities, far more than the typical university professor. Was his brain underdeveloped?

Men in their late teens and early 20s have been engaging in warfare for millenia. Were their brains underdeveloped?

This claim is a real insult to young men. Why is it being advanced and promoted?