Actually, the reason language is so important at a young age is because if you don't exercise that part of the brain, it will begin to detiorate after so many years. As was the case with "Genie" (that girl in the room). That was physically why she couldn't say more than 20 or so words. [On a side note: just how fucked is our court system, the charges on Genie's mother were dropped, and after a number of years, Genie's mother successfuly sued for custody of her daughter . . . only to stick her in a mental-hospital].

But yeah, the brain is highly advanced organ, that if neglected, will deterioate certain portions of itself . . .