Ch. 14-2 By Sandragail02 Jan 1, 1400 Islamic empires prospered. Jan 1, 1990 The people of Botswana had a life expectancy of 60 years. The people of Botswana had a life expectancy of 60 years. Jan 1, 2000 Life expectancy was lowered into the 30s. Jan 1, 2010 The number of African children orphaned by AIDS could reach 20 million by now.