We don't know enough about the brain to make definite statements, except to say that at the moment, substantial evidence is absent, etc. If GID can only happen in adulthood, that doesn't add up with evidence considering how most transsexual people identified with their brain-gender well before adulthood.

Since my earliest memories I felt something was wrong. I felt like a freak from my childhood to an adult. I had to fake things that did not feel natural to me so I could blend in the best I could. You spend most of your life acting a part and otherwise I felt like I would not be accepted by my peers or my family. And you spend so much time acting and putting up walls that you forget why your doing it or who you are. I looked back on my life and I had many memories but in many ways it all felt like a fog. Even though I remember everything it felt like I was living some one ells's life. I could not make sense of why I felt that way. Back in 2013 my Dad past away and the walls I had put up started falling. Many memories I had stuffed away started coming back in a rush and realized why I spent so many years in depression and feeling miserable. At this point many would think I would go off and get HRT and get surgery, but no. I am one of the few that has elected not to because I can't stand the thought of losing everyone I love. And there are other reasons but many would not understand those. The reason why I commented is because its not something that comes about when you are an adult, you suffer from it your whole life. And I hate it when people that do not understand what a person like I and others like me go through talk about it as though they were an authority on my life. I have lived it, you have not and so can not begin to talk about what you do not know. I am not trying to be an ass but you have no idea what me and others have gone through our whole lives(not just adulthood). It is miserable existence, acting out a life that is not you at all. You realize that no one you know truly knows you but only the part you play. Like I said I love my family and even though they don't know me I know enough about them that I want to keep them in my life so I am one of the few that has chosen to remain silent, but your not family so I have no problem telling you.

Most transgender children know their true gender by age two, according to my doctors and multiple documentaries I've seen. I knew by at least age 5 and it was a huge issue for me my entire life, especially during grade school through high school. It has caused numerous health problems in my adult life because I didn't have the support and correct info. that I needed. The American Psychiatric Association no longer considers being transgender or transexual a mental disorder or illness.

Another Christian bigot promoting faux science by the other Chrisitan bigot named "Dr McHugh" who has been discredited by all medical and psychological consensus? I find it fascinating how trolls so suspiciously interested in this subject seem to crawl their way to every legitimate scientific journal/research in order to disseminate false information on the subject.
Seek help from a qualified psychologist because your well known behavior is pathological

One of the things that an endocrinologist treats is hormonal sexual dysfunction and may not have studied transgender origin and is just giving you her/his opinion from her/his understanding, without the knowledge about the research.  Research on cadavers shows opposite sex brain structures in transgender people.  The origin is from pre birth.  The brain was formed differently and the theory is that biologically it happens at conception or at the 8 week mark of pregnancy.  The article is correct.  A endocrinologist or any doctor should know the difference between assumption and knowledge gained from studying and research.  Your endocrinologist made quite a leap in judgment.  Just because you have an area of knowledge doesn't mean you know everything about a specific specialty withint that field.  This is why we have the judgmental society with have.  Doctors giving opinions like it is fact.

What someone says is never written in stone when it comes to a complicated topic such as this.  The medical profession certainly doesn't have a 100% understanding on how our body works.  As it becomes easier to study issues like this with better technology the understanding grows.   Being closed minded never helps our understanding of a complicated biological topic such as this.