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OK but what is your and OPs point?

For every "teen" Captain there were like thousands of privates, not to mention farmers, deck hands, apprentices, other workers.

And their offspring are the majority...

'teenager' is a modern construct, probably to limit the labor market.

> Arthur MacArthur Jr who made Captain by the age of 21

That's definitely young, but the average age of a Captain in the US military today is 27, and you can be one as early as 25.

I think we need to draw a line in the sand though and say fast, forced development doesn't work on humans as well as some imply it does. You cannot make the brain "grow faster"; that's not how humans work.

You can influence the shape in which a young brain grows much more easily and to a deeper extent than you can a mature brain. The neural systems one develops during adolescence will determine a lot of their psychological traits and the course of their life.