42 Now, there is a death which is called a temporal death; and the death of Christ shall loose the bands of this temporal death, that all shall be raised from this temporal death.
43 The spirit and the body shall be reunited again in its perfect form; both limb and joint shall be restored to its proper frame, even as we now are at this time; and we shall be brought to stand before God, knowing even as we know now, and have a bright recollection of all our guilt.
44 Now, this restoration shall come to all, both old and young, both bond and free, both male and female, both the wicked and the righteous; and even there shall not so much as a hair of their heads be lost; but every thing shall be restored to its perfect frame, as it is now, or in the body, and shall be brought and be arraigned before the bar of Christ the Son, and God the Father, and the Holy Spirit, which is one Eternal God, to be judged according to their works, whether they be good or whether they be evil.
45 Now, behold, I have spoken unto you concerning the death of the mortal body, and also concerning the resurrection of the mortal body. I say unto you that this mortal body is raised to an immortal body, that is from death, even from the first death unto life, that they can die no more; their spirits uniting with their bodies, never to be divided; thus the whole becoming spiritual and immortal, that they can no more see corruption.
President Joseph Fielding Smith said:
“Death is a purifying process as far as the body is concerned. We have reason to believe that the appearance of old age will disappear and the body will be restored with the full vigor of manhood and womanhood. Children will arise as children, for there is no growth in the grave. Children will continue to grow until they reach the full stature of their spirits.”
(Answers to Gospel Questions, comp. Joseph Fielding Smith Jr., 5 vols. [1957–66], 4:185.)