36 years this week - Oct 3, 1975

President Kimball announced in general conference the organization of the First Quorum of the Seventy, and the first three members of the quorum were sustained.

[Source: Church News: Historical Chronology of The Church of Jesus Christ of Latter-day Saints, http://www.ldschurchnews.com/articles/58765/Historical-chronology-of-The-Church-of-Jesus-Christ-of-Latter-day-Saints.html]