It’s twin power. Identical twins are less likely to die young from unexpected causes, perhaps because of the close social bond between them.
David Sharrow and James Anderson at the University of Washington in Seattle have examined data on Danish twins born between 1870 and 1900. By comparing the fate of these twins with the general population from that time, they say they have identified a “twin protective effect”, which seems to boost the likelihood of twins surviving into their 60s.
