Obviously this won’t work for all sports, but things like football, track, soccer, it would allow for de-gendered team, even allowing athletes with the skills but not the genetically-endowed physical attributes to have a place to play.
Note: I know very little about sports and being on a sports team, so please point out anything that doesn’t make sense.
No I don’t understand what you mean about 18-22. What difference does that make?
18-22 is a fully sexually mature adult. The testicles and ovaries are already functional by 14 in overwhelming majority of the population.
And yes I’m putting everything into two piles. Either you have testicles or you don’t. If you have functioning testicles, you will always have more T than someone who doesn’t.