I believe there should be limits to what minors should be allowed to do. When an adult becomes sexually attracted to a minor, the society frowns at it because it is believed that the minor does not have the mental capacity to give consent. Gender transition is something an individual needs to think through before proceeding with it. Children undergo different growth processes and at each stage, their taste, personality and how they see life might be affected. At that point, any wrong decision made may live with them for a lifetime.
I can recall how as a child I wished to be so many things which I ended up not being. Right now as an adult, I wouldn't consider being any of those things I wished to be as a child. If I am in the position to make and implement this law, I will criminalize gender transition surgery on all minors with or without the consent of their parents. They should be adults first and then we can be sure they actually consented to it themselves.
I completely agree with you. It's a funny fact. Alcohol is only available from the age of 21, while you can change your gender tomorrow.