Olav is right that humans used to live shorter lives and I think marriages began at the beginning of the teens in the middle ages (sometimes the man was older so he had established a profession and his bride was a teen,)
Pisces also was right about monogamy not being the natural instincts for hunter/gatherer societies, for instance, the men hunted afar from the village together and the women stayed and did the gathering of fruit/vegetables at the village itself. When a man & woman mated and had a child, they would live seperately from the village and the man would stay & protect his little family until the child was 5 or 6 years old, able to follow its mother around - then the man went back to the hunting group and the woman & child went to the village. No more union between them.
But now it's the modern day and the industrial revolution has changed everyone's lives and we have high school & college to go through before marriage in many cases. Establishing a profession is still very important to forming a family. But our natural urges are still set at that teenage time for mating. Since we all will live long lives probably (some of you who are young now reading this may live well beyond 100 years old just due to medical innovations continuing to happen.) So, controlling the instincts toward polygamy, early mating, rushing into marriage with any number of partners, etc. is a wise choice in an age of infinite choices.
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