put it this way, if it is in your head, then you won't get it out of your head properly until you get a new set.
To say if it truly has gone off or not, it be best to actually look at it. But normally they have a stranger looking 'black plastic' sort of look and they're just hard. And yeah, once they're off, they're only good for burn outs.
If they're stored out of the light, they'd be fine. If they're on the shop floor too long, or in light for ages, then the UV and air doing its thing, break down the rubber and make it well 'ard..
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