Assuming the unit has been kept in a reasonably normal environment temperature and humidity and pollutants wise, the only part that can simply deteriorate from age alone is the elatomeric (synthetic rubber) suspension. Unfortunately elastomers weren't as durable 20 years ago as they are now, so it's sort of a crap shoot whether a given unit will be OK. It might work for awhile only to collapse, or it might not collapse but have become so hardened from age that it doesn't have the compliance (springiness) necessary for proper tracking/tracing of the grooves. If it doesn't give satisfactory performance, it can be rebuilt. The question is would it be worth it . . . . . .
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