Answer:
economically underdeveloped
Explanation:
The countries that have the highest percentage of young individuals are the underdeveloped countries, or rather the poor countries. The reason for this is that these countries have very high birth rates, but also low life expectancy. This results in a situation where almost entire population is young and middle aged, while the elderly people are lacking. The reasons for the high birthrates are several, ranging from bearing pride by having more children in the family, fear of losing the children because of poor living conditions and diseases, tradition, workforce for the farmlands.
