I would say it entirely depends on how they were stored and what you plan to use them for.
If they have been kept in a cool, dark place in an air tight container, they will likely be fineto use in spellwork and ritual, though I wouldn't suggest using herbs of this age in tea or for consumption unless you can be sure they are safe.
However, if they have been kept in a damp location, in an unsealed container they may not be good to use at all. Scent, colour and texture can help determine how fresh they still are. A grey or brown colour and a very subdued or foul scent, soft and damp to the touch are signs they are bad and should be disposed of.
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