Landlord's Replacement Charges for Very Old Carpet

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Quoting Mr. Knowitall

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If you stain the carpet, that's damage. If the cheapest solution is carpet cleaning, and that is sufficient to remove the stains, then the landlord can charge for carpet cleaning. If the stains are such that the carpet must be replaced, then the tenant can be charged the depreciated value of the carpet.

California generally regards the useful lifespan of carpet in a rental unit to be eight to ten years.

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So, if the carpet is years past the useful lifespan (say 12-15 years), what could they reasonably charge the tenant to replace the carpet? Is the value of the carpet 0$ and therefore the landlord could charge 0$ On the premise that it needs to be replaced?

Landlord's Replacement Charges for Very Old Carpet