but am scared of the lost and how long it will take him to understand what his doing, because it hasn't been very easy for me. So what your opinion please I need help?
14 years are less, i think you should wait for him to be around 18. Because money is not everything, he should enjoy his life but if his enjoyment is in learning trading then i think only teaching him/her will be a good idea like you can make him Demo accounts or teach him backtesting trading. But for both, he needs, great knowledge of trading fundamentals, and i was at that kid place and my enjoyment is in learning trading from a person (you) which i don't know-how is in trading, but if you are good, then i think i will become rich around 25 because until then, i will be a pro trader and memory is quite remarkable i early age so that's a good age to teach some kid trading.
18 is the age when a kid is no longer a kid. In some countries starting from 18, a person is able to buy alcohol, smoke and gamble. In some countries it is allowed for 14 year old kids to trade and operate with money. In some countries, parents, when their kids becomes 18, release them to adult life (basically kids leave parents houses by themselves and start their own life). And you suggest that kids should "be around till 18".
I think you and we should let kids be more independent. Otherwise we will get society, when kids live with their parents and on parents expense till they are 30. Even at 14 the kid is no longer a kid. And with access to the internet, they grown up much faster. Even at school they are taught logical thinking and importance of money. 14 is a good age for kid to start learning to trade, invest. I see nothing bad if kids looses all of his money at that age from bad investment. It is better to do mistake when you are young, learn from that and dont repeat that, than do that mistake at 30.