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dimar (2)
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In my mind the old Marty shouldn't exist while the young Marty is absent from the whole timeline. The old Marty should only exist in the future of the future. Unless the universe is somehow aware in advance that the young Marty will return to his time line. My biggest issue with time travel is that if Doc Brown could create a time machine, so will someone else, and eventually many more will create one as well. It's the same for any other time travel story. And if you take other alien civilization out there in the universe, that would make it countless of beings doing time travel somewhere out there constantly.
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