I disagree. A PL is not a "natural language" by definition (it's eminently artificial). Although PLs do evolve over time, they seem to be essentially different in structure from natural language, in that they have a precise syntax and well-defined semantics, unlike natural language. And, I disagree that fluency -- in a PL or a natural language -- is more easily developed as child than as an adult. Children just have a more powerful learning environment (total immersion).
Having said that, I do think that learning programming young is a good idea, but not because it's "easier" for children. Instead, they simply have a much longer time to get used to the "logical way of thinking" (I don't know of a more concrete term for this, but hopefully you know what I mean).
I would not expect someone who started at 10 and is now 20 (10 years experience) to be a better programmer than someone who started at 20 and is now 30, or even someone who started at 50 and is now 60.
Having said that, I do think that learning programming young is a good idea, but not because it's "easier" for children. Instead, they simply have a much longer time to get used to the "logical way of thinking" (I don't know of a more concrete term for this, but hopefully you know what I mean).
I would not expect someone who started at 10 and is now 20 (10 years experience) to be a better programmer than someone who started at 20 and is now 30, or even someone who started at 50 and is now 60.