My cat is 19 years old. After reading the below, please share any similar stories, comments, advice, TYVM?

My cat is 19 years old. She's an indoor cat. Just recently I've noticed her hearing is not as good as it used to, her eyes are a bit cloudy, but I know she can still see pretty well. She eats and drinks pretty good. Although she doesn't sit when she eats anymore. She'll eat for a min, then come by me, or walk around, then she'll go back for more. She's been on the dry Purina Indoor Formula crunchy food for years, and laps in good amounts of water. She still can get up on my bed, go down the stairs, she is still playful when you tease her head (hugging your hand, playfully biting). She seems like she's always been, she's slower, just some old age factors I guess. I've had Rajah since she was approx 5 weeks old. I've never had any other cats in the house. We've had 4 different dogs throughout the years, (that she ruled over! LOL) I fed her the dairy cat milk from a dropper. She thinks I am her mamma. My question is this... How long can cats live? I'm 33, going on 34 years old. I've had her since I was 15 years old. I am hoping she doesn't have a quick decline... But because of her age, I am so paranoid everyday that it may be her last day... Do you have any suggestions/advice?