The Ages of the First Presidency/Q12 When Joseph Smith Died

Joseph Smith was only 24 years old when he was sustained as the head of what would become The Church of Jesus Christ of Latter-day Saints, and he was 38 when he was killed. These were the ages of everyone the day he and Hyrum died.

First Presidency
JOSEPH SMITH -38
Hyrum Smith -44
Sidney Rigdon -51
John Smith -62
Amasa Lyman -31

Quorum of the Twelve
Brigham Young -43
Heber C. Kimball -43
Orson Hyde -40
Parley P. Pratt -37
William Smith -33
Orson Pratt -32
John E. Page -45
John Taylor -37
Wilford Woodruff -37
George A. Smith -27
Willard Richards -40
Lyman Wight -48

Average age: 40.5