Can he charge me for carpet?

Hi everyone!
I have been renting my current home for almost 6 years and am not ready to move on to buy a house. When I moved in the carpet was not new. Over the course of 6 years, the roof leaked which caused some staining on the carpet. But then there is also a couple of pet stains and major wear. However, the carpet is poor quality. Not my landlord is bringing up the pet stains and wants to charge me for replacing the entire carpet. Can he do that? Thanks so much!
p.s. I am in Los Angeles

sorry, I meant I am NOW ready to move on....

The LL can charge only a depreciated value for the carpet in the unit ruined by pet stains. Items are depreciated over a number of years off a LL's taxes by taking a small percentage of the cost each year from his taxes. Most LLs use a number between 5 and 10 years for carpet depreciation purposes, the average is 7 years. If he used 7 years and the carpet had been new at move in, the most he could charge you with is 1/7 the cost of the carpet's replacement (since it is already at least 6 years old). If he uses 10 years on his taxes, he could only charge you with 4/10 of the cost had it been new at move in. Since it was not new, he can only charge you by the following formula:

Depreciation years - age of carpet = remaining life of carpet
Remaining life / depreciation years = percentage he can charge you

Example: If the carpet is now 8 yrs old, he can charge nothing if he uses 5 or 7 years on his taxes and only 2/10 if he uses 10 years.