Guys tend to not compete before 18. Girls tend to start competing before 18 ( as an Elite ) and tend to be done by then, getting ready to go to college.
They also have to fight off becoming a woman ( in the body ). Guys tend to benefit by getting that last growth spurt from 17-19.
Other priorities such as college, career, families. It's not like pregnancy does anything to us ( besides not sleep, stress, etc )