Life Expectancy of Water Pump?

I just inherited a 98 Camry V6 with 160k on it, and it just had the timing belt and valve cover gaskets replaced - runs beautifully. While these replacements were definitely overdue, I'm wondering about the water pump. Haynes never gives a mileage for having it replaced, but it seems like the one part that is bound to go at some point, but that people never mention. Am I right, or will the dead thing go on forever?

So, any general mileage markers out there for when the water pump will...

Life Expectancy of Water Pump?