Going back to the original question...
According to Christian Theology:
Pearly Gates is an informal term for the gates of heaven based on this Bible verse:
Revelation 21:21— The twelve gates were twelve pearls, each gate being made from a single pearl.
Though either those gates are really tiny or those are giant pearls.
Moving on...
As for the gold thing, that may be due conceptions of wealth and riches during the middle ages when a lot of Christian religious paintings were done. Besides, gold is a lot easier to see than pearly gates on clouds?
Concerning Ghosts:
Typically, "ghost rules" are that whatever you look like when you die (age, clothing, sometimes condition the body is at death), that's what your ghost looks like. So if Demi Moore died at 80, Patrick Swayze would have to deal with her wrinkly body.
Oh, and no "copies" in heaven, it's a one soul per body deal.
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