I'm trans, bit old even.
HRT for underage being some limited? Can talk, sometimes kids may do not know what they want, some could verify with extra care and without ideology, if these kids are really into some other gender. Then if they are - let them be. Even before puberty (or maybe extra before). Or maybe just give them a bit of self care too? Uneasy topic, can understand some argues (whatever my personal, liberated view is on that). (with extra note, I'm totally not against hrt for trans younglings, but could talk about verification if that underage really know what they want, and that who would verify that, hope not a priest?).
HRT for adults, who may wants to decide about OWN body? Like, I can legally get a tattoo, even on face. Can get whole new hairstyle or go bald, I can buy breast augmentation, get piercing. Can buy alcohol and cigarettes that will damage my inner body for a moment of peace in my mind (with a risk of overdosing and way more damage). Can devote own life to science or some god. It is legal to do so much stuff to self... but altering gender, even makeup or some clothes... impossible nope never.
Uhm sorry, triggered and went out of a meme, again
[edit] - by hrt for youngling, I mean full scale HRT, not just blockers to delay. Delaying, giving time is imho always good.
Giving hrt to all transfolks is also big yes.
I only worry, if younglings who say they are transfolks, trully are, or they do that on a whim, phase or such. That should NOT be excuse to ban treatment, but I'm ok if young ones get some friendly verification. In oppose to adults, that should do not need any verification.