My cat Emily is an 18 year old domestic medium hair. Technically, her mother was pure persian, her father was everything else. She is solid white with one blue eye and one green.
Anyway, she past senior cat years ago and now is ancient. Her hearing is gone, eyes are clear of cateracts, but her she doesn't seem to see all that well. She has arthritis in most of her joints. Basically, she's really old.
My concern is her body functions. She seems to going #1 and #2 near the litter box, which is on the floor in my laundry room, but not in the litter box. I took her to the vet on 2-4-09 (two days ago), and the vet could feel that she had a full bladder. I am concerned that she may be loosing control of her bodily functions, what that could be a symptom of, and what I should do about it. I don't have a lot of money to spend on treatments, and I don't want to keep her alive if she is in pain or suffering.
We went through this with our 19 year old cat, Furface. Your cat probably has arthritis, and has problems getting in and out of the litter box (after all, if you were 90+ years old, you'd probably have a hard time with stairs, etc!) What we did is, buy a larger box that is not as deep. That way, it will be easier for her to get in and out of the box. You could also buy an additional box-she may be trying to make it to the litter box but just can't get there in time. Make sure you place it at an easily accessible location for her.
I have the excat problem with my ancient tabby - 19 years old and going strong - we put puppy wee wee pads all around her litter box and that seemed to help a great deal. Other than that, she's just old and can't get into the box anymore. Hope this helps