My 15 year old son has been building his own video games with Unreal Engine for a few years..
I was recently looking for mentors to work with him and advance his skills, targeting college aged kids / young 20s..
It was surprising to me how many people I came across in this field at this young age that are trying to focus on the "higher level" game planning aspects and not so much on the lower level implementation specifics.
I highly recommend the Handmade Hero series to folks in his situation. Casey has put up an absurd amount of material for everyone for free.
https://www.youtube.com/playlist?list=PLnuhp3Xd9PYTt6svyQPyR...
https://guide.handmadehero.org/hmcon/
https://guide.handmadehero.org/
https://handmade.network/forums