@Unkraut
You may consider yourself to long in the tooth to change your views. Honestly is that a sound basis to decide the lives of others.
I believe that in saying that, you've effectively disqualified yourself from the debate.
As I have said before, I have been close (and very close) to a number of trans people. My niece has one friend in particular; a retired professional person. They have transitioned, had surgery and now have transition regret.
Post surgery regret is experienced for every type of surgery. My great Aunt has hip pain in one hip. She had a replacement with a good result. A few years later she had increased pain in the other hip, so again she opted for surgery. This time she had a terrible result - post surgery excruciating pain that the NHS failed to manage. They took the hip joint away leaving her with no hp joint and became housebound and isolated. She ended her life by refusing to eat and drink.
Some gender confirmation surgeries do not conclude with a favourable outcome, just like other surgeries. This can lead to post surgical regret. I think we all understand that. Post surgical regret for gender confirmation surgery is remarkably low, but the rate is not zero.
My niece's friend regret's their surgery, though not because the surgery didn't go well. The surgery was carried out in England in a private hospital.
This friend, let's just call them 'N' from now on, had lived a fulfilled life as a transvestite and gay man, very actively engaging in social and sexual life as such. They were not married, not harming any one.
At my house one evening (this was some years ago) said I think I might be trans like you girls. There were no words of encouragement, there was exactly the opposite. He was actively discouraged. They knew that his life was already happy and fulfilled. They 'knew' that he wasn't trans, because they knew that he could not be happy about his life one day, and so sad about it the next that this sudden desire to be a woman was real. Perhaps his motivation was that these 'girls' as he tended to say, had become his closest circle of friends, they were all close friend with much genuine affection for each other.
His decision to begin transition was a misjudgement on his part. So it isn't just children who can misjudge.
N's transition took two years, the legal minimum, and a timeframe not generally available, but he was comfortably off and had the ability to pay whatever was required. He admitted that his goal was to get a GRC. He admitted that he had told the psychologist at each appointment that he was experiencing gender dysphoria. He heard stories of the panel rejecting some applications, so he had surgery 'to make his case more convincing'.
When he told that group of friends of his surgical regret, they all cried together, but did admit that the others had actively tried to dissuade him.
So what can we learn?
That peer pressure is not necessarily a factor. In N's case the peer pressure was not to do it.
That a 2 year medicalised process of transition did not prevent N's transition. There was a professional diagnosis of GD because all GD is self-diagnosis anyway. One simply needs to say it for it to be true.
If a person like N of any age living in say Ireland now had set themselves of a GRC, they would not need to make the mistakes that N did. In Ireland can self-ID and it is pretty much granted on request with out the medicalisation model. Self-ID might will have prevented N's mistakes.