President Young said he herd Joseph Smith say that the Ten Tribes of Israel were on a Portion of Land separated from this Earth. He had also herd Joseph say that Children would not Grow after death & at another time that they would grow & he hardly knew how to reconcile it. He would like a variety in Eternity. Children might grow in intelligence & not in statue as well as a grown Person. If his Children were grown up after leaving him he would not know them.
[Source: Wilford Woodruff's Journal: 1833-1898 Typescript, Volumes 1-9, Edited by Scott G. Kenney, Signature Books 1993, http://amzn.to/newmormonstudies]