The U.S. draft age in World War II was primarily 18 to 45 for actual induction, with registration required for a wider group of men.

Core answer

  • In 1940, the Selective Training and Service Act required men 21 to 45 to register for the draft.
  • After Pearl Harbor, the law was changed so that all men 18 to 64 had to register.
  • In practice, however, the men who were actually drafted and sent into service were generally 18 to 45 years old , not the entire 18–64 group.

So, when people ask “what was the draft age in WW2” in the U.S., they are usually referring to that practical range of about 18–45 for induction, even though registration rules were broader.

Information gathered from public forums or data available on the internet and portrayed here.