A few, by 18? I was looking for people to make the argument that most could, well before 10. I'm not talking about the skills that come with decades of experien

A few, by 18? I was looking for people to make the argument that most could, well before 10. I'm not talking about the skills that come with decades of experience, but just a conceptual understanding of the unique functions of the languages - functional and syntactic abstraction - closures, lisp macros, etc.