Poverty cuts life expectancy: in the poorest areas of Britain, people on average
have eight years’ less life than those living in the richest areas.
Ill health can and does cause poverty. And further, people do tend to migrate when economic circumstances change.
Intelligence is strongly correlated with economic success, and good health (a mix of better correlation and causation*).
* Marrying your first cousins for tens of generations doesn’t do good things for either your intelligence or disease genes
It’s not fair, dammit! All must die 8 years earlier!