Wouldn't the orcs have lost their immortality when they were corrupted?
Old elves, like Elrond, have great magical power, but orcs don't have this power - they would have lost it when they become orcs. So I think they would have lost their immortality as well. As for how long they live, it wouldn't have been long, though perhaps longer than a human. How old was the Great Goblin in the Hobbit?
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What it was could not be seen: it was like a great shadow...
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