The guidelines for trans female athletes for the 2024 Paris Olympics involved transitioning before the age of 12/puberty to be eligible.
There's more info at https://www.independent.co.uk/sport/olympics/paris-2024-olym...
Incidentally, many countries/states are working hard to make it impossible to transition that early.
Incidentally, many countries/states are working hard to make it impossible to transition that early.