Sorry to post about personal experience again, but it is regarding giving people hormones under the age of 16. My non binary friend retweeted a thread about how its messed up the NHS refuse to give hormones to people under 16, and there should not be an age limit at all.
For me, when I was 13/14 I wanted to be a boy - that feeling lasted for a few months and I even tried to dress more masculine. I was very confused and soon realised I was not trans but just not accepting of the fact I was a lesbian. I thought if I were a boy, I'd have a much easier life being a straight guy than a gay woman (due to discrimination).
If my parents had taken me to the doctor in those short months and I was put onto hormones, I cannot imagine the amount of mental and emotional damage it would have done to me, at such a young age. I'm glad my parents just let me go through that phase and let it pass, they left me alone with it and told me everything will be okay, it's normal to feel that way for a bit.
I know there are trans people who feel that they are trans from a young age, and I have no problem with the person using a different name/pronoun and discovering it for themselves. They should never ever be told "right okay, you're a boy who wants to wear princess dresses, we are going to take you to the doctors and get you on estrogen" unless that child is obviously emotionally distressed as being called he/she and boy/girl then yes take them to be assessed and see what's going on.
But hormones should only be given to someone who is 16 and over, and has gone through the correct assessments.