I'm not sure about speeding maturity, but it definently helps with learning a thing or two.
Example. My g/fs 9 year old brother has been playing MS and other MMOs for the last 2 years on and off. Because of his constant interaction with older people, he has developed a much better literary understanding of what he's saying or wanting to say. He's in elementary school, but he has the literary capacity of someone in high school, and can even teach them a thing or two.
Not only that, but he can type faster than every person in the school, including the teachers.
Example. My g/fs 9 year old brother has been playing MS and other MMOs for the last 2 years on and off. Because of his constant interaction with older people, he has developed a much better literary understanding of what he's saying or wanting to say. He's in elementary school, but he has the literary capacity of someone in high school, and can even teach them a thing or two.
Not only that, but he can type faster than every person in the school, including the teachers.