Are Orcs Immortal?

[Eru]

On the other hand, if Orcs derived from Men then the awakening of Men must have been much earlier than the arrival of Noldor in Middle-Earth. Tolkien never resolved this problem

i beilieve this to be way out of the question. the awakeining of men when have been shortly after, or at the same time, as the elves. and that means they could not have had the time to move from the East, Unless of course, the place of their awakening was to be changed as well. but still, that just cause too many problems. way too many...