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Not exactly sure how long it would last, but seeing how it has never been opened and it is "synthetic"... I would think that it would last for quite some time...just like synthetic nutes.
A friend of mine recently used some for a pre-employment test. The bottle had been opened and used for a previous test several months before. It still performed perfectly. Not sure which brand name it was...
I think that you should be good, but if you don't feel safe, just get a new bottle and keep your peace of mind.