Why does fertility coincide with a career and stuff in life?

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I can't understand why we are more fertile in our late teens/early twenties when people's brains are not fully formed and matured until later. It makes it come across as though that is the ''ideal'' time to start thinking and having children but back then, that was the last thing on my mind while it was during the time I left sixth form, went to college for two years doing art and design and then wanted to go on to uni. Looking back and knowing this information, it makes it feel as though we ''should'' have done these things earlier despite not being mature enough and not ideally in the 30s and over for both men and women.

Because becoming fertile earlier is an advantage in a world where people couldn't count on making it to middle age.

If you reproduce earlier, from a genetic standpoint it doesn't matter if you die, you've already contributed to the next generation.