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Serpentines can last up to ten years an an average car. When looking at the belt on the ribbed side, you need to replace it when there are two sections of ribbing missing within two inches from each other. If there is a small(1/2) piece missing from 1 rib, the belt is fine.
Most dealers recommend changing the timing belt every 90,000 miles. Depending on driving habits and conditions the belt may last longer. I have heard of belts lasting 180,000 miles! The first gen LS's (1990-1994) have a non-interface engine, so if the timing belt breaks it's not going to damage the engine. If it breaks you'll just be stranded.