Draft age is lowered to 18. On this day in 1942, Congress approves lowering the draft age to 18 and raising the upper limit to age 37. In September 1940, Congress, by wide margins in both houses, passed the Burke-Wadsworth Act, and the first peacetime draft was imposed in the history of the United States.
https://www.history.com/this-day-in-history/draft-age-is-lowered-to-18

