According to the LDS Doctrine of Exaltation, where did the Father live as a man? According to the LDS Doctrine of Exaltation (the Father was once a man who was exalted by his Creator to Godhood as Christ is exalted by the Father), did the Father live on this Earth at a previous time, on another planet in this cosmos, or in a previous cosmos that we are unable to observe?
God the Father, Elohim, dwelt as a man prior to the existence of the observable universe. 

It was by His power that the known cosmos were formed and organized. He did not live as a man on Earth, or on any planet which exists within the known universe, because it was by his power that the known universe was created, the first creation being Kolob, the star nearest to the place where God the Father dwells:


  
  Kolob, signifying the first creation, nearest to the celestial, or the
  residence of God. First in government, the last pertaining to the
  measurement of time. The measurement according to celestial time,
  which celestial time signifies one day to a cubit. One day in Kolob is
  equal to a thousand years according to the measurement of this earth,
  which is called by the Egyptians Jah-oh-eh (see Facsimile 2).
  


Facsimile 2:


Most of what we know about the greater universe comes from Chapter 3 of the Book of Abraham. We have not received any other source of information which gives us any more clues as to the mysteries of our eternal celestial heritage (see The Book of Abraham: A Most Remarkable Book).