United States - Population Ages 0 to 14 for Upper Middle Income Countries was 20.10273 % of Total in January of 2020, according to the United States Federal Reserve. Historically, United States - Population Ages 0 to 14 for Upper Middle Income Countries reached a record high of 40.03267 in January of 1966 and a record low of 20.10273 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 Upper Middle Income Countries - last updated from the United States Federal Reserve on April of 2024.