Tag: fertility
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The Arithmetic of National Decline Every nation runs on a demographic ledger. Births minus deaths equals natural change. Immigration minus emigration equals net migration. Add them together and you get population growth or decline. The arithmetic is simple. The politics are not. For decades, the conventional wisdom in low-fertility countries has been that immigration can…
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At 33, the epigenetic clock lurches. That is not a metaphor—it is a measurable phase transition in the female methylome, a discrete inflection point prospectively associated with cancer onset and systemic inflammation. It also happens to be the age at which female fertility begins its steepest and most clinically visible decline. The two facts are…
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The Uncomfortable Truth About Male Fertility Male fertility is not a switch. It is a slope. And for most men, it is a slope that has been sliding downward for decades without anyone noticing. Sperm counts have declined by more than 50% globally since the 1970s. Testosterone levels have dropped by roughly 1% per year…
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The Threshold That Doesn’t Announce Itself Women have a clock. It announces itself. The fertility decline is steep, measurable, and clinically visible by the mid-thirties. Men have been told they don’t have a clock—that fertility persists indefinitely, that the only limit is desire, that the sperm will keep swimming as long as the machinery works.…