In reply to victorclimber:
It depends entirely on how it's been stored. If it was unpacked, in a loose bag, in a dry, not too cold place, then it won't have deteriorated much if at all. If it has been stored compressed for years, or gotten damp, or been exposed to a lot of UV it won't have fared as well.
Take it out and give it a shake. It should be fairly obvious what sort of condition it's in?