United States - Population Ages 0 to 14 for Least Developed Countries was 38.81632 % of Total in January of 2020, according to the United States Federal Reserve. Historically, United States - Population Ages 0 to 14 for Least Developed Countries reached a record high of 44.92393 in January of 1983 and a record low of 38.81632 in January of 2020. Trading Economics provides the current actual value, an historical data chart and related indicators for United States - Population Ages 0 to 14 for Least Developed Countries - last updated from the United States Federal Reserve on March of 2024.