Nissan Pathfinder

Nissan Pathfinder, 1997, 198000 miles. The other day out of the blue the engine wouldn't crank. Battery power seemed fine. I checked the ignition relay and the clutch pedal switch, both checked out fine. As a last resort I banged on the starter with a hammer. And it started right up. What does this mean? How long can I expect this starter to last? Should I replace it as soon as possible?
November 13, 2006.

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