I have seen a lot of individuals  in my work  in co-dependent relationships that have this particular injunction.  Individuals who are parented by their partners and often feel they would not survive if something happened to the family.  Individuals who are controlled by others but seem to dis-miss that this is the case or just adapt to the situation.  Individuals who struggle to assert themselves or claim their right to have a voice and opinions of value. Individuals who feel useless at times because they are scared of growing up.  Often not having the tools in the toolbox to engage in adult life adequately.  These individuals can often experience the adult world as hostile and live in fear while holding onto not growing up.  The problem is that this can get progressively worse with individuals feeling more and more overwhelmed by the prospect of engaging in adult life.  Think of the film Author or the idea of Peter Pan.  Its sometimes inviting to go into these roles and places but to live in the constant mindset of this is difficult as one never really feels deep down  that they can survive life as an individual.  To really feel “you know what, I can do this”.  It is often the youngest child who get a down grow up injunction.  Its common for the mother to over-nurture the youngest as they don’t want to let go of having a kid around.  Or the parents who define their whole world on the child and being good and rescuing at every opportunity. Or the parents who have not grown up themselves and therefore cannot pass on the adult tools of life.  Or the father who struggles with his growing daughters sensuality and his discomfort is transferred as she cant engage in being a woman but stays a girl inside.  Even over-loving and wanting to be needed thus, over available to a child can render them feeling incapable of adult survival.