As some of you know, John's dad's cat lives with John and I. We pretty much think of her as our own now. Anyway, she is solid grey (or blue, or whatever the proper term is). I've noticed the past few months that the fur on her sides are turning to a rusty brown color. I thought that maybe she was just dirty since I was told she had only ever had one bath in her life, but after a bath and several baths with baby wipes, the rusty color is still there. She is approximately 6-7 years old but no one really remembers, she's definitely not any younger than 6 but could be older. Could it just be that she's getting older?