More like, learn how to evaluate those decisions and advocate for their own healthcare, which is something everyone needs to learn and practice in the US eventually.
Medical interventions for adolescents is always going to be controversial and no simple heuristic will solve it. Hopefully if kids are more comfortable expressing their identity and not comforming to traditional stereotypes then medical treatments will feel less necessary.
Did you sneak that in by mistake? Kids shouldn't be making any serious medical decisions for obvious reasons. This is law in many countries.