So why are the effects of a trauma when aged 20 treated differently from the effects of a trauma when aged 12?
That is a great question and maybe the answer to that would depend on the type of psychologist or therapist. It might be to do with stages of child development, if they liked the cognitive guys. I don't have time to search out a trustoworthy journal article, but if you google "Piaget's stages of cognitive development" then from 12 years onwards it is the more "logical and systematic" forms of thinking that are developed up until adulthood (presumably 20). I thought I would add that in Hashi.
I haven't done any inner child focus work, that I know of. My knowledge of the concept of an inner child is really as basic as an opinion: it is the idea that we all have a symbolic inner child inside, sort of like a bubble inside which collects all the experiences of childhood and then we carry it around. When being creative, I used to think about my inner child years ago because she was haunting me. It hasn't served me any other purpose, other than I like the symbolism and liked to write about her. It was all metaphorical, I couldn't hear a child in my head or anything. I would write a bit more about it, because there are things that came out when I was writing this post but they are maybe too upsetting for you when you're not in the best place. The whole inner child idea only came back to me from joining this forum, and not sure my concept is a match for the people who developed it as a therapy concept.
I can see why you don't like it. It sounds like it doesn't fit you because you weren't taken care of and had to grow up faster, so your whole notion of being a child is to be grown up at all times, and as an adult why would you want to go back to feeling like a child, you would feel you were being treated as a young child when it is clear you are not a child? If you were unable to articulate things as a child that you could put into words or feel as an adult now, then maybe the reconnecting with all the periods of time in your life, and this is a method that has been decided as appropriate.
Your post is very clear, and makes sense. Asking why this is being used for you and expressing everything you've said is a good idea. Clarification is helpful, especially because you don't buy it for you. Maybe you would if it was explained solely in relation to you by a T. Then if you still don't buy it, they can try something else.