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I have always heard the 100k rule of thumb for o2 lifespan, but to my mind, if it isn't throwing your FE off and your fuel trims are ok, I see no reason to change them.
FE is always such a tricky beast. There could be 100 reasons why your FE is low, o2 sensors among them.
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'97 Honda Civic DX Coupe 5MT - dead 2/23
'00 Echo - dead 2/17
'14 Chrysler Town + Country - My DD, for now
'67 Mustang Convertible - gone 1/17
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