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.