To be a species of mainly one gender is a challenge in itself…
The High Elves are a community whose population is entirely female … until the change.
High Elves grow up together. Separate families do not exist. Instead, the young are given over to the High Elven community to be raised. Parents may help to guide their young, but they have no ownership or control.
As all High Elves are free to pursue whatever they desire, it includes choosing when, and even if, they wish to undergo the change: female to male. Unlike the Dark Elves, who have no choice, the change is mandatory.