She's super healthy for her age, 15 is kind of a guestimate. No one is really sure exactly how old she is but our landlords daughter is 20 and she says that Salty has been around as long as she can remember. And I've seen pictures of my friend when she was a little kid and Salty was in the picture.
Our landlord pays for us to take her in to the vet for checkups, and he says she looks great for her age. Last year she had some teeth extracted, but other than that we've never had any problems with her. My roommate loves her as if Salty were her own cat. I'll post some more picture of her in another thread.