Jon,
I do believe it's Natures way of keeping an "Open Mind" so adjustment
can still be made to meet life style and enviroment changes with less
diffculty
Jon stated;
Actually, according to recent studies, that doesn't change until about
25. The brain is still not mature until that age, apparently.
http://community.webtv.net/tassail/ILLDRINKTOTHAT
http://community.webtv.net/tassail/GOODNITE