Earlier quoted context omitted.
I wonder the same thing trying to learn a new language. I notice the biggest difference between me and a child is that children don't care about messing up. Meanwhile I often have this worthless apprehension of "better not practice Spanish on these Spanish speakers, I might mess up and feel stupid." I tried to learn Spanish like I learned how to program. Now I'm living proof that you can become good enough to read bo…
I suspect adults learn languages a lot faster than kids, when we spend the same amount of time being exposed & practicing. All the polyglots say you have to be willing to mess up a lot and work to shed your fear of feeling stupid. In fact, try to seek it out because that's the primary way you get feedback & learn.
I'd postulate it's probably easier for trained adults to learn new programming languages as they're more familiar with structured syntax and the semantics involved, and are more likely to have exposure/experience with a similar language. Also, concepts from one programming language carry over to another, even if they're expressed differently.
I don't have any studies to back this up; it's just my gut-feel.