Men marry for logical reasons, they believe they need to secure a woman to keep the benefits of a relationship going (or she will leave). Women tend to marry for emotional reasons, excepting gold-diggers.
Given this, why are more men choosing to marry less?
It is illogical to do so.
Why? Ant and grasshopper.
If a man wanders off and makes a success of himself (attractive prospect in the marriage market) in the same time that a woman is wasting her youth (and yeah, that’s important for fertility reasons), there is no logical reason to buy in, especially when they can get a woman younger than themselves and less entitled (age does that).
What is the solution?
Women aren’t going to like it….
Become better wives.
Like a job, you need to demonstrate the skills before you get that promotion. It requires effort. Hey, just like a marriage!
One word: EGO.
“Here then is one possible projection of the future of mankind’s life on earth. The histories of past universal states allow us to make some general postulates about our own future, and can even offer us some positive lessons, but perhaps the single greatest lesson that we can learn from them is a negative one. Mankind longs today for a world united in peace and freedom, but in the past only the bitter experience of prolonged disunity and war, culminating in intolerable anarchy and distress, has moved men to attempt the salvation of their hard-pressed societies by the forcible unification of rival parochial polities. Even if this has not invariably resulted in the imposition of a tyranny, it has always presaged the eventual downfall of a society. Today we cannot afford the luxury of waiting to learn this lesson by a repetition, at first hand, of our predecessors’ experience; for, if we do wait, the choices open to us will be reduced to alternatives of a world tyranny or the end of life itself. Our knowledge of the past histories of other societies than our own must move us to forestall disaster by taking the future into our hands. If we sit back, we shall find ourselves overtaken by events that have passed beyond our control.” ~ Toynbee, A Study of History, Part VI Universal States. Published 1972.
There is no such thing as a successful atheist country.
Like it or not, humanity appears to require religion to thrive.
Faith begets faith in humanity and on a smaller scale, community. The community must be homogenous for members to find contribution fulfilling instead of depriving (surrendering resources to a geographically present, invading outgroup). “Diverse” communities corrupt and become parasitic whatever the excessive funding or weak leadership (see: The Third World for the results of decades of patience and tolerance). Anyone with computer access can research this.
Thankfully, atheists reproduce less because their superior intellects have trouble reading fertility replacement charts.