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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.
Every 60k miles. Assuming the belt was changed at 60k miles, then you have 38,500 miles until next change (@137,000). It is an interference engine so definitely keep the belt changes on schedule. A snapped timing belt can ruin your engine. Recommended service is every 60K miles.