Instructions on calling of missionaries-- Archives, Salt Lake City, Utah. ... Age: Young men should be twenty years of age before they depart for their missions unless they have had two years of college or military service, in which event the age requirement is waived. Young women should be twenty-three before they are recommended for missionary service. However, because of special requests from mission presidents for more experienced help, the age limit has temporarily been lowered to twenty-one. /... GEO. ALBERT SMITH, J. REUBEN CLARK, JR., DAVID O. MCKAY, First Presidency.
[Original circular letter, L.D.S. Church in Clark, James R., Messages of the First Presidency (6 volumes)]