I went to a school where they did try to introduce these subjects to us from a young age. I'm talking the age of 10 onward and it really was pointless.

Of course you can teach things about Roman Legions, or Athenian ships etc, but if you want to debate and discuss the ideas and foundations of these civilizations (and any philosophy) I honestly think you are fighting an uphill battle until at least 17-18.

Your mind is just not developed enough to handle the kind of ambiguitiy and complexity needed to analyse and judge these ideas. Many people never even reach this ability during university and just parrot ideas that are told to them.

There is a reason teaching children to adhere to a religion from a young age is so controversial in some circles.

It can be useful to learn things early and able to revisit them later with a fuller understanding.

Maybe, but if we can't have "Diary of Anne Frank" in class, I wonder how people would feel about the renaissance art viewings.