There may not be. I don't know. I had just always heard that you that. I had also heard of people having their cats for 20 - 30 years. Again, I wouldn't have asked if I didn't have a cat that is pushing 19.
Nineteen is certainly a senior, for a cat, but he (or she) may still have some good years ahead of him. If my math is correct, according to the formula that I linked to, your 19-year-old cat would be the equivalent of 92 years old, while Cutie would be 128.
Our calico, who was named Taffy, lived for 19 and a half years. She would be waiting for me to come home from work, and I would give here a spoon full of vanilla ice cream in her bowl. She loved it.
Ella begs for ice cream but only because she thinks it's yogurt. She loves yogurt, although only about a spoonful at a time.
I'm just happy I have talked with someone whose cat has lived as long as yours. My cat is my first senior cat so I am trying to learn what is in store for both of us. I have had people ask me what kind of cat I'm going to get when this one is gone. I respond with, she may outlive me. I'm not going to worry about what kind to get when she's gone until she goes, if she does. Thank you for your information, Ken Anderson! As I said, I am just learning.
One of the most important things is hydration, as senior cats tend not to drink enough water, which leads to kidney problems. If you're not already, adding canned food to the mix can take care of that, especially the ones that come in a gravy. Adding a little warm water to it can achieve the same purpose.
We had a cat that liked green peas. Maybe it was the odd smell. I read it's not uncommon for cats to like olives. Wonder if it's because of the salt? I hesitate to give my cat too much meat prepared for people, because of all the salt. OTOH, maybe cat food is salty. I've never tasted any. I was going to, but the mad cow disease thing a while back scared me.
Cutie has always been a beggar but I don't give her much that has been salted or spiced. I don't think it takes much salt to be too much for a cat. Usually, I'll set some meat or chicken aside for her before cooking it, and cook it without embellishment. Then when she begs, I'll feed her from her own stuff. She likes that "ask and receive" thing so if I just put the bowl down before her, she'd eat a little bit of it and walk away. Ella, on the other hand, will almost never eat anything that doesn't come from a can or a kibble. She will eat chicken cat food but not real chicken, and I don't know what that's about.