Culture. Though it can be further broken out into various causal effects that also interact. Let’s use Japan for example — due to its strict work culture, those who are at fertile ages tend to be overworked and don’t have time to pursue relationships. Simultaneously, with gender role being a part of the tradition, more progressive young women are avoiding men with more conservative values. And other forces play into this — e.g. religion, family values, climate, etc.
I should have started with this, but at the end of the day imo it’s mostly environmental and social factors that influence this
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