What symptoms do you have?
Blown seals usally leak. If you lift your fork boots up from the bottom and compress your suspension by holding the front brake and moving the forks up and down with the bars you should see oil on the chrome if they're going. Piles of oil running down the fork leg if they're totally shot.
If neither is happening and the fork is mushy you could just have old, contaminated oil, you could just be low on oil, you could have wasted fork seals AND be low on oil. If you or someone else just serviced the forks and they're leaking they could have been overfilled.
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