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O2 sensors are subject to aging...one week I replaced a Boxster one and a Honda one days apart. And yes 'aging" is a common fault code for something that sits in the exhaust stream, it was mine at around 50k. Replaced and never had a problem again. Usually the front right side goes first (looking from the rear).
I'm assuming you used the correct sensors when you replaced them?
The fault code you describe is not one in my DME book so I'm unable to help further as I don't know either where the fault is occurring nor why. If you doubt the sensors, swap 2 of the new ones and see if the fault follows the swap or stays on the original side.
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