Does Sparkling Cider Ferment?!

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Sparkling cider won't ferment in an unopened bottle if that's what you're asking. It will eventually go bad though. You can only tell after you open it. If it has lost it's carbonation, smells funny, or foams after opening, you probably will want to trash it. Shelf life for Martinelli's brand is 3 years or more if stored in a dark, cool area. If all of your bottles have roughly the same expiration date then just open one now and see if it's ok. If it's good, then the rest will probably be good too. (Assuming they were all stored under the same conditions.) Good luck!