TOlkien never actually say right out that Orcs are immortal, but I believe thaey are. Orcs were elves, but twisted and warped into Orcs. ALso, there were always lots and lots of them. I think why we don't find Orcs from the 1st or 2cnd ages is because they usually got killed in a fight or some other way. I saw someone say that the Great Goblin (The Hobbit) recognized Glamdring+Orcrist. NOt necessarily. He just may have heard of them, as most of the Orcs probably would. Tolkien says they recognized the swards, but he may mean the recognized what swords the swords were.
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