Older women more likely to conceive twins due to evolution

Women are more likely to conceive fraternal twins once they reach their 30s as a result of an evolutionary response to combat declining embryo viability, according to a new international collaboration involving researchers at The University of Western Australia.

While it is already well known that women are more likely to conceive twins during the middle of their reproductive life, the research findings, published today in Nature Ecology and Evolution, explain the evolutionary history behind this phenomenon.

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