Here's what I'm thinking on this.
Orcs are corrupted Elves. The basic structure of what they are cannot be changed by Melkor or Sauron, only currupted.
Therefore, I figure that if they don't get killed (which is probably impossible for Orcs) they don't die.
If that is the case, then Elves could conceivably capture an orc of whatever age (won't be too old as they keep on killing each other off or get killed by their enemies), and the Elves have years and years to accomplish their task. They'd need it, but if I understand the STRUCTURE of Tolkien's mythos, un-corruption of an orc is possible.
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