It may help to think of it as a medical treatment. We don't withhold heart surgery from a child just because they aren't 18 and can't legally consent to it, and

It may help to think of it as a medical treatment. We don't withhold heart surgery from a child just because they aren't 18 and can't legally consent to it, and likewise we don't withhold treatment for gender dysphoria just because of age. Note that the diagnostic criteria for this treatment are very strict. It's not gonna accidentally be given to a mere "tomboy".