NeverarGreat said:

In many accounts of Near Death Experiences or OBEs, deceased loved ones are often seen as in the prime of their life, even if the OBE-er couldn't ever recall seeing them that way. So actually, having a young Anakin Skywalker ghost makes more sense than seeing the image of an old man who could have only appeared that way if he was not horribly mutilated decades ago. Of course, that would mean that the ghost of Obi-wan would need to be played by Ewan McGregor, and they would need to make a CGI version of Yoda of him in his vigorous tadpole years.

Also, in NDEs or OBEs, subjects (almost exactly 100% of the time) see experiences related to whatever religion/tradition they were raised in (because their brain is randomly firing neurons as it dies). So I guess we'd have to determine the religious tradition Uncle Owen and Aunt Beru raised Luke in, if any.