Hmm, this document uses 20 to 64 as working age, which gives us an upper bound but a different lower bound.
This source suggests that labour force is defined crudely (as you suggested) as anyone over the age of 15, but it also says it excludes people who are retired. And since the average life expectancy is only 62 in SSA, I don't know whether that means African women are retiring to be supported by their (large) families or whether they just work until they drop, especially since for subsistence farmers, there's probably always something that can be done around the farm, even if granny isn't really contributing much.
In conclusion, I'm stumped.
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May I recommend Albion's Seed? Fascinating book for anyone interested in the history of America or the Anglo diaspora.
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