The dragons in The Fall of Gondolin couldn't stay away from Morgoth for too long otherwise they ran out of energy. The Olog-Hai stopped functioning when Sauron stopped looking at them. I would guess most of the none-maia creatures would be like this, they could live as long as the Dark Powers powered them up for, if they stopped powering them they would die. There are some exceptions, what about the Nazgul's Bird things? They lived for thousands of years. And the Kraken lived for about that too. I think Orcs would suffer the same fate of Elves- there bodies would fade away until they were nothing but a mean spirit.
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Utúlie'n aurë! Aiya Eldalië ar Atanatári, utúlie'n aurë! The day has come! Behold people of the Eldar and Fathers of Men, the day has come!
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