Are you intentionally missing the point for the sake of argument?
If the part of your brain that deals with identity is not formed until around age 25, then you do not know who you are until that age. It's not a complicated thing to grasp.

I can attest to the validity of this statement also, for the person I was when I was younger is completely different to the person I became when I reached 22+.

Consent is something different, it's being able to say yes, even though your parents are saying no.

For the parents to have the opportunity to say no, they would need to know about it. These operations are permitted without the parents having the opportunity to even express their concerns or attempt to convince their children to wait a few years and see if they still feel the same. This is immoral, and a potentially life ruining law. Your attempts to justify this are genuinely unsettling. I am very grateful that you are not in a position to make decisions of this magnitude that could affect the lives of so many of our world's children.