Charmion, I agree with that. An adult decision should be made by the person when s/he is an adult. Otherwise it is a legal minefield.

It's tough for the young adults having to wait to take control of their lives but I think there should be legal capability to make a decision on their own behalf.

The TV documentary link is here:

Four Corners: Not a boy, not a girl

Look for that title which was aired 3 March 2020.

It will only be available for a limited time and I really don't know if it can be viewed from outside of Australia. The link I posted before to the news article will cover most of what is discussed in the documentary.