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Source:Brigham Young:1867:JD 12:67:the Lord called upon Joseph he was but a boy—a child, only about fourteen years of age
Brigham Young (1867): "the Lord called upon Joseph he was but a boy—a child, only about fourteen years of age"
When the Lord called upon Joseph he was but a boy—a child, only about fourteen years of age. He was not filled with traditions; his mind was not made up to this, that, or the other. I very well recollect the reformation which took place in the country among the various denominations of Christians—the Baptists, Methodists, Presbyterians, and others—when Joseph was a boy. Joseph's mother, one of his brothers, and one, if not two, of his sisters were members of the Presbyterian Church, and on this account the Presbyterians hung to the family with great tenacity. And in the midst of these revivals among the religious bodies, the invitation, "Come and join our church," was often extended to Joseph, but more particularly from the Presbyterians. Joseph was naturally inclined to be religious, and being young, and surrounded with this excitement, no wonder that he became seriously impressed with the necessity of serving the Lord. But as the cry on every hand was, "Lo, here, is Christ," and "Lo, there!" Said he, "Lord, teach me, that I may know for myself, who among these are right." And what was the answer? "They are all out of the way; they have gone astray, and there is none that doeth good, no not one." When he found out that none were right, he began to inquire of the Lord what was right, and he learned for himself. Was he aware of what was going to be done? By no means. He did not know what the Lord was going to do with him, although He had informed him that the Christian churches were all wrong, because they had not the Holy Priesthood, and had strayed from the holy commandments of the Lord, precisely as the children of Israel did. 
- Brigham Young, (23 June 1867) Journal of Discourses 12:67..