Most leather wear would not be considered a warranty issue. If you wear jeans a lot, the dye from your jeans may transfer to the seat and give it a bluish tint. In that case your option is to use leather cleaner to clean the seats.
If you park your car outside all the time and don't use any sunscreen on your windshield, your interior will eventually start fading. There are some protectants that you can use to delay it, but it will start fading eventually anyway.