It is conventional to credit medicines and hospitals for long lives, but we should also give due regard to such conventional consumer products such as shoes that make life past the age of 40 worth living at all.
Today a peasant in the fields of a Guatemalan village wears shoes that medieval lords would have traded for their own models made of wood and leather. Even bums who beg for a living in big cities, and do their best to look the part, have a hard time finding shoes that look appropriately worn and ragged.
Concerning China, accounting for 80 percent of shoe imports, how interesting a turn of events this is! When capitalists of old used to speak of China, they imagined all the shoes that could be sold to a country so populous. Who would have imagined that it would be China that would turn out to be the maker and seller of shoes to the world?