Hello. My cat is about 13 years old. She has always been in good health. She has had her regular check-ups and the only time she has ever been sick is when she started having hairballs and throwing up her food. She is still very active and kills birds and squirrels and stuff. The only problem is that her hair is starting to change colors. The top of her head is changing from black to brown. And her hair has become very rough too. My question is, do you think she could be sick? Or is this just a normal thing given her age? I guess I just want to know if I should be worried. How much longer do you think she will live? I don't know how I would handle it if she ever died. I've had her since the day she was born.