Is it common for a younger sibling to stay in the "young and innocent" phase longer while they grow up. I say this because i have noticed that the friends I have, including myself, don't seem like their personalities developed fully. It is almost as if they still rely on their older brother or sister to do all the talking and take all the action for them. As oppose to the older siblings, who are more in "control" and show more confidence. Anyone notice this?