You are all the ages you've ever been.
Whatever your age, you are also all the ages you’ve been before. Part of your psyche is an infant, because past selves remain as parts of an increasingly complex self-system. Younger parts of self, with unhealed wounds and unmet needs, can interfere with adult life, until they get the necessary loving care from the most adult parts of self.
Now, without an awareness that the self has parts, we are likely to feel crazy the moment our feelings do not agree with one another. I want to eat the cake, but I also want to be in a caloric deficit. I want to keep playing in the snow, but I also want to go inside and warm up. Knowing it's impossible to do both, I might well feel crazy whenever a pair of incompatible desires assails me.
Unless, of course, I have an understanding of the self as a dynamic composite, in which case it all makes sense. A more ancient version of this same fact can be found in the distinction between monotheism, and the polytheism it replaced. If there are many Gods, as Plato pointed out in his Euthyphro, their desires can be in conflict with one another. But the God of a monotheist cannot do this, for lack of any opposing competitor. In the work of making sense of a dangerous world, each had its advantages. And it was Plato who first discovered (or at least, first mentioned) the inner child, in the Phaedo. But I digress. Let’s return to the self.
Think of a moment when your behavior seemed to you to be immature for your age, or otherwise irrational--procrastination, for example. What tasks are you avoiding? Part of you wants to complete these tasks and enjoy the sense of accomplishment and relief that comes from a job well done --but part of you prefers to keep deferring the inevitable. When you catch yourself engaged in this pattern, perhaps you are harsh and punitive with yourself. Perhaps both the avoidance and the punishment feel somewhat alien—-as if you were not quite in charge of either of those inner and outer goings-on.
Where, then, do they come from? Whenever anything just doesn't fit with the present reality, we can ask ourselves what it might fit with from the past. The mind doesn't randomly generate errors, so much as it displaces significant, meaningful things from one context to another, where their meaning is far less evident.
Perhaps the part of self who is responsible for procrastinating is an overwhelmed five or six year-old kid who is genuinely frightened of adult tasks, and concerned that completing them would result in abandonment. That is, if he shows he can take care of himself, nobody will ever take care of him again—so he procrastinates, instead. Or rather, he forces you to procrastinate. The purpose of his boycott is to make sure that he, the inner child, gets the loving attention he needs, as a matter of (what feels like) life and death.
Perhaps the part of self who is responsible for the punitive attack on the procrastinating, needy child is an embarrassed, rageful adolescent. The inner teenager is, after all, disgusted and repulsed by the frank, naive, primitive neediness of the defenseless child. The teenager’s whole existence is about escaping from childhood, parting company with it, and often marshaling a bitter contempt for it in order to bear the terror and loss of saying farewell to childhood forever. This explains the savagery of the “super-ego” when it punishes that lost little kid for the sin of imposing inconvenient delays on the whole (inner) family.
The inner adult, the most adult self, is the part who is best able to nurture, respect, protect, and educate all the younger parts of self whose difficult states of mind sometimes rise to the fore and feel intractable. Instead, your most mature self, the parts of your personality that are most intact and best developed, can be encouraged and equipped by psychotherapy to re-parent the rest yourself. Freud taught long ago that each of us is all the ages we have ever been. Like ancient Rome, the psyche is a many-layered thing, in which deeper levels from long ago persist beneath contemporary layers with more life and less history. Conversely, being young involves more strength and less wisdom, so that the middle-age we so long dreaded becomes a domain of awareness, rather than mere lost youth.