Why do female gymnasts look like 12 yrs old boys?
.............
Lady curves are made of fat. If that fat gets burned and crowded out by muscle tissue, you end up with more of a male look.
Give those young women some time out of the gym and give them a baby, they’ll look like other women.
It's a developmental deficiency.
They are structurally immature at 17.
Lady curves are also supported by wider pelvis bones. Not all women have the classic “child bearing hips” (bones) and I suspect the ones who do, do not compete as well against women with narrower hip bones. Just a thought.