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Nature Reviews Urology 3, 351 (1 July 2006) | doi:10.1038/ncpuro0533

Paternal age over 40 years linked with reduced reproductive success

de La Rochebrochard E et al. (2006) Fathers over 40 and increased failure to conceive: the lessons of in vitro fertilization in France. Fertil Steril 85: 1420–1424 Maternal age >35 years has long been known to be an adverse risk factor for reproductive outcomes.