We have used this toilet for a long time. I don't know if toilets can wear out, but I can certainly attest to the fact that this one did not. We are replacing it with one that is more suitable for a bidet. You will see stains on it. They are not from what you might think; they are iron stains from our well water. With a bit of cleaning solution you should be able to remove the stains.
Please text, rather than e-mail. I am much more likely to be aware of a text than an e-mail.