Hmm, I don't see anything in there related to skill acquisition in younger vs older people, I'm afraid. Most of the links are about skill acquisition in general, and how the brain changes. One is to a Google book that won't show the page (I don't know why, it says the page is unavailable), and the last link is a teacher saying he guesses children learn more quickly because they're more plastic (but I guess they learn faster because they have more free time/willingness to practice)...