Yes. There are drug therapies and hydration techniques that can lengthen her life and give her some peace.
Keep in mind that most cats with renal failure will go blind because of retinal swelling and detatchment if the progression is not stopped. So, her life could end with her being confused about her surroundings.
Therapy for this is in steps -
First, you will want to flush the kidneys with sub-q fluids. This will help a great deal. You can even do this at home if you are not squeamish about needles.
Then you need to change her over to a prescription renal diet that you can get from your vet. Often, this alone causes a marked improvement.
Third, you can use a drug therapy to stop the progression of the disease.
This IS common at this age but it can be helped.
If your cat doesn't do well at the vet, I would call a mobile vet and have someone come to your home. There are mobile vets in almost every city, now.
I just lose my 17 year old cat in the same way but she all the sign of the disease - the blindness, the lethargy, the confusion. It was not a pretty thing to watch. I do feel bad for you and know what you are going through.
I hope this helps.
Let me know if you have questions.