I have 2 kids 14 and 12. My 14 year old has started solving medium level leetcode problems (which I am happy about).
Talk to them often about code, technology etc.One thing that helped IMHO spending a lot of time in solving math problems (AOPS) , which made think through hard problems and had to grind through solutions which took time. My kids love Big Bang Theory and anything that is geeky. I talk to them about the latest things that are happening in tech like the recent hack and the malware.