I think the way to answer this question is to imagine the universe of math students from age 8 to 21 and imagine which of them could learn 'bog standard journey

I think the way to answer this question is to imagine the universe of math students from age 8 to 21 and imagine which of them could learn 'bog standard journeyman CRUD programming' at the pace your son has. I'm going to hazard a guess that you could teach it to most children his age although perhaps not as fast. I think the main obstacles being motivational and esoteric, not cognitive. Not sure I like the structure of the poll choices either. Does anyone really think that trigonometry is at a higher cognitive level than the classes that are taken before it?