How many people under the age of 21 died in Vietnam War?

Answer 1

Of the more than 58,100 Americans who died in Vietnam, 11,465 KIAs were less than 20 years old. The average age of all casualties was 23.11 years old. According to the Department of Defense's Combat Casualty File, the average age of an Army infantryman serving in Vietnam was 22. None of the enlisted grades had an average age of less than 20.