I also found this from the website listed below

“The Window of Opportunity to Learn Easily

Research shows that a child’s brain is especially receptive to learning a second language from birth to about age 10 or 12.

Changes in the Brain

A child’s brain will actually build new synapses in response to experiences. “The child who learns piano (for example) will learn those connections and 20 years later will learn to play the piano again easier than someone who has not studied it. Harry Chugani neuroscientist at Wayne State University

Children’s Brains treat a Second Language the Same as their Native Language

Children who learn a second language early store both their native and second language in the same locations in the brain. Older children may have a harder time because their brain has to do extra work to create additional space for the second language. Joy Hirsch, Ph.D., professor of neuroscience at Cornell University Medical College.

Young children are able to reproduce a native accent flawlessly

As a rule, the younger the children are, the better their accent will be, especially if they’ve had some foreign language training before learning to read English.

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exposes to other cultures

useful

but

if not continued usually they forget it in a few years.

good luck =]