[SpaceNoodled]

Pollution.

[andrepd]

Surely a factor, but hardly the sole explanation; malnutrition rose, that should give you some pause.

[harvey9]

In the towns yes. A wealthy city man could expect to live fewer years than a labourer in the countryside.

[oblio]

Pollution, malnutrition, maiming by industrial or mining equipment (huge percentage at the start).