51 years this week - Oct 7, 1960

[David O. McKay Office Journal] 8:30 a.m. Held a meeting with President J. Reuben Clark, Jr., and President Henry D. Moyle. We three decided upon the calling of the following men to be Assistants to the Twelve: [Nathan Eldon Tanner, Franklin D. Richards, Theodore M. Burton]. After we had taken up the matters before us, President Clark broke down and said that he would not be able to attend Conference--said he is not well enough; that his legs are weak, and that he cannot get up the steps. I wept with him, and reluctantly said that he probably should not attempt to attend the meetings.

[Source: McKay, David O., Office Journal]