Migrant workers in the 1920's would typically have a somewhat poor state of health. Their life expectancy was much lower than the average.
"Nickel and Dimed: On (Not) Getting By in America" by Barbara Ehrenreich details the life of low-wage workers, including factory workers.
farmers and factory workers
Assuming that you are comparing peasants in feudalism to factory workers during the early industrialization era, you could say something similar to this: Akin to the life of peasants, factory workers endured harsh working conditions with little compensation and were often provided a place of residence by their superiors.
What was life expectancy in
farmers and factory workers
According to the World Health Organization, both Costa Rica and Chile are the most advanced countries in this regard, with a life expectancy of 79 years (2011):Chile: Male life expectancy: 76Female life expectancy: 82Overall life expectancy: 79Costa Rica: Male life expectancy: 77Female life expectancy: 81Overall life expectancy: 79
Antiguas life expectancy is 90
Factory workers
Child factory workers, like all workers, were supervised.
You need workers in a factory to watch over and run machinery.
Workers were available factory jobs because of the High Wages.