The youngest age of soldiers that was legal was 18, but people lie, as we should know. That may have been true in America but in Germany the Hitler Youth were drafted at the end of the war, when boys as young as 10 were called up to fight. Young soldiers also fought with the Soviet army.
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If you're talking about the US Military the youngest is probably Calvin Graham who joined the Navy at age 12 in 1942.The youngest overall nobody knows,during the war different countries had different minimun ages to serve.The Indo-British army had boys as young as 15 serving in combat,and the Nazis towards the end of the war had servicemen as young as 12.The soviets had some underage boys serving in combat,although nobody knows who was the youngest.The Chinese probably had many underage servicemen,and last but not least partisan groups frequently had 17 year olds or younger as fighters.The examples given aren't the only ones,in Great Britain the youngest to die in combat was only 14,and the british tried to avoid using underage soldiers during the war so as not to repeat what happened in World War 1.The best guess as to the age of the youngest serviceman including partisan groups, is probably less than 10.