[gridlockd]

Fair enough, here's the missing part:

Tall women have trouble finding partners because women not just want a tall man, they almost universally want a man who is taller than them. It's the same for high-earning women, they almost universally want a man that earns more than them. The same is true for education or job status and many other factors, and they compound.

https://en.wikipedia.org/wiki/Hypergamy

Women who are exceptional in one or more of these traits face a commensurately smaller pool of men that are acceptable to her, whereas every man in that pool is attractive to a commensurately larger pool of other women. However, men are not hypergamous, they do not care about earnings or education and they prefer shorter mates. Therefore, the males in that pool are more likely to end up with another female than the exceptional one.

Unable to find an acceptable partner and absent societal pressure in western societies, those exceptional females may defer or give up on reproduction.