The wire that provides the suspension only ages with use. As in it eventually will suffer metal fatigue due to being under stress. When not being used this part will not age, (unless it happens to corrode but that will depend on the material I guess).
Any rubber, (natural or synthetic), parts of the suspension probably will age and at best change their compliance at worst actually start falling apart.
Suck it and see really. I'd try putting it on and try lowering it on to a non rotating record. If as you lower the cart down on to the record it sags badly then it's obviously shot. If it looks about the right angle, then give it a play and see how it sounds. Do it on an old record that you don't really care about initially just in case it should decide to collapse when being played.
A couple of years ago I spun up my TT with a Lyra Clavis cart on it that hadn't been used for over 10 years. It sounded pretty much exactly as I remembered it. At least I couldn't detect that it was doing anything obviously wrong as it sounded great. It was about between 11 and 12 years old at the time.