For me at age 10 my children should understand the market and how it works, interpreting chats and deciding the next move of each coin from studying the price action of different coins. At age 13 the should start trading with a demo account and at age 15 they should have funded their first account. This would help them become financially independent, also help then limit future gambling prowess and also make them prepared for their careers
My oldest son is 10 years old and while his thinking (and math) is very good, he doesn't have the maturity for this.
Fake moves, FUD, all this can easily surprise ca kid at this age. So no, I think that at 10 years he cannot understand fully all the charts would show.
I can't tell for the 13-15 years steps, but imho you're rushing it. And a child needs to enjoy his childhood; he has plenty of time later to think on how he can earn more money.
The same format we use pictorial representation to teach our kids alphabets and numbers. It could be in a well cartooned form that would look so enticing with lots of pictures. Make it as fun as possible just the same way the recite their alphabets not knowing what the really represent learning this acts without knowing what the really are until the are matured enough to handle the information. Certainly they will still have enough time for their fun plays. Many young kids are really pulling out cash from the net this days