Most accounts of human life history propose that women have short reproductive spans relative to their adult lifespans, while men not only remain fertile but carry on reproducing until late life. Here we argue that studies have overlooked evidence for variation in male reproductive ageing across human populations. We apply a Bayesian approach to census data from Agta hunter-gatherers and Gambia...

Twins and higher–order multiple pregnancies account for approximately 3% of all gestations in the United States (Ananth et al, 2004) and seem to be stabilized since 2006 after a dramatically increase since the beginning of the 1970s (Vayssière et al, 2011). There are two main causes for the change in the rate of multiple pregnancies: advanced maternal age and use of assisted reproductive techni...