Some puppet people identify more with James Bobin's 2011 film (of Jason Segel and Nick Stoller's screenplay) THE MUPPETS. And others identify more with Robert Lopez and Jeff Marx's 2003 Broadway musical AVENUE Q.
In THE MUPPETS, characters "come of age" when they face the hard reality of the world they live in and choose to hope for something good anyway.
In AVENUE Q, "coming of age" is portrayed as the moment one can finally blow up the icons of his/her childhood and move on...presumably to a place of world-weary wisdom.
Puppet people tend to land on one side of this divide or the other, I think. You either choose to believe, or you choose the surlier-than-thou path.