Should I replace timing belt on 04 Honda Civic that I just purchased?

Should I replace timing belt on 04 Honda Civic that I just purchased? - 1
Added (1). I bought an 04 Civic with 123k on it. The dealer doesn't know if the TB was replaced but said his mechanic thinks it "looks" fine. My co-worker insists that if the car has made it to 123k without the TB breaking that it must have been replaced, and thinks I should risk not replacing it right now. Does that seem like a reasonable assumption? Just want to get some opinions, I know I might just have to replace it for peace of mind anyways.

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