Old cat!

[racing_gurl07]

I usually post in Pet General, about my bird, but i thought i would post in here about my cat, Kitty, she is 20 years old, and is somewhat blind and deaf, but is still running around. How long do cats usually live until? Everyone tells me to put her to sleep but she seems to be doing fine. The only thing that worries me is that, a couple of weeks ago mymom told me that she had two seizers, so i hope she can live another few years. here is a picture of her...