They didn't die of those diseases because they didn't live long enough to develop them. They died of injuries — being gored by an ox, shot on a battlefield, crushed in one of the new factories of the Industrial Revolution — and most of the time from infection, which finished what those injuries began.
No se morían de esas enfermedades porque no vivían lo suficiente como para contraerlas. Morían de lesiones. Corneados por un toro, o por un disparo en una batalla, aplastados en una fábrica nueva de la Revolución Industrial.