While I'm all for a person pursuing whatever makes them happy (or "whole"), I too feel that some decisions should be held off until adulthood. Sometimes feelings change. I shudder at some of the decisions I made pre-adulthood, despite being 100% "sure" at the time. I guess what probably motivates my thinking is watching some of the people I grew up with. We knew at a very young age that they were "different", despite not being particularly aware of homosexuality (this was the early to mid '60's after all). Great people, just "different". Yet it took several into their fifties, after heterosexual marriage and kids, to come to grips with the fact that they were gay....and always had been. Despite what those of us around them "knew", they genuinely did not have a clue (or so they say) until they were older and more mature. So that's all I have to go by. I have no problem whatsoever if someone wants to transition, but there's really no going back, so they need to be old enough and mature enough (yes, I realize that maturity is not guaranteed with age) to be absolutely sure the decision is one they can live with going forward.