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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
Well I don't think at that age they must learn in trading, for me --trading is a sort of gambling, it needs a source of fund to continue your activity in gambling. I don't know if at that young age they can handle the situation. Perhaps you can teach them how to do that math calculation in trading but no money involved yet.