Guessing by the size of Sauron and Saruman's armies, I'd say original orcs from the first age are immortal, but newly born orcs are mortal. I think it's like how Aragorn is a Dunadan he's 87, whereas over humans is Gondor live a normal age.
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'But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.'
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