"while you were typing 7 new replies have been posted"
...
I'm inclined to discourage, or at least temper the possibility of a sex change, with the reminded that teenagers are really bad at making informed, objective (pardon the pun) choices. Objective is sixteen IIRC, and honestly I don't think that's the best age to be making this kind of decision.
My personal opinion is leaning heavily towards the "no, don't do that" direction, but feel free to disregard that as you wish.
My advice to you is to wait, and make sure you understand all of the implications. Talk to people about it. Research the topic as much as possible. Make
sure this is what you want to do before you do it.
Other than that, though, I'll leave it up to you to decide, and I will provide what small amount of support that I can.
Edit:
Or you could actually respect people having the right to bodily autonomy with regard something that only effects them, rather than trying to impose yourself as a gatekeeper to their decisions. You do not know better than a trans person as to whether they need treatment, period.
I most certainly am not imposing myself as gatekeeper, and I doubt Shinotsa is either. I'm saying that Objective is young and (from personal experience), young people make bad decisions with about the same frequency as good ones.
The point is
not to arbitrate the outcome, but to
remind him that this decision
needs to be well-informed.