Hillary Clinton - the politician who didn't know when to leave the party
For most people, growing up means learning new things and remembering old lessons.
The lessons tend to be both similar and simple. Don't lie. Don't cheat. Don't steal. Perhaps, most crucially of all is the moral code which dictates that when you screw you up, you put your hands up and don't try to blame anyone else.
We all know someone like that - the person who has never done anything wrong, or to be more accurate, the person who has never put their hands up, admitted their mistake and accepted responsibility for their actions.