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Starting point for kids/teens?
Just in case don't force anything, it could be he isn't interested. That curiosity should be on him, but sometimes you have to throw reeses on the floor to attract the ET.
My son is also into gaming and started with a juvinile course creating roblox games. Say what you want about Roblox (you are right) but it is a fantastic introduction to basic development in a game environment (remember, reeses) Two years later, now at 14, he started a python course and comes every Thursday excited to show me what he learnt.
My daughter on the other hand, will throw up just thinking about it xD