I was going to say use the "what a child doesn't learn" article; the blog tour I posted earlier said, "What if Hogwarts didn't exist? Hermoine would have learned to pretend she didn't know magic!" (boo)
but you asked for scientific rigorous,
so i googled the phrase "google scholar social development and acceleration"

http://m.joa.sagepub.com/content/21/2/180.abstract

it costs $25 bucks, but says it lists refrences.

Youth lives by personality, age lives by calculation. -- Aristotle on a calendar