Everywhere in the world women live longer than men - but this was not always the case. The available data from rich countries shows that women didn't live longer than men in the 19th century. What is the reason women live more than men do today, and why have these advantages gotten bigger over time? The evidence is sketchy and we're only able to provide partial solutions.

Everywhere in the world women live longer than men - but this was not always the case. The available data from rich countries shows that women didn't live longer than men in the 19th century. What's the reason why women are more likely to live longer than men? Why is this difference growing over time? The evidence is sketchy and we have only incomplete solutions. While we are aware that there are biological, behavioral, and environmental factors that play an integral role in women who live longer than males, we aren't sure the extent to which each factor plays a role.