The lowest median age is in Uganda at 15.5 yrs and the lowest level of education is Ethiopia at 2.5 years with a considerable size of working population. “Young developing” are mostly African and some middle eastern countries. “Young middle income” are mostly south American, the more advanced African countries, south Asian countries. "Young advanced income” are for the developed countries. The highest median working age is in Japan at 45 yrs and the highest level of education is in Japan at 13.5 yrs.