For people who've had cats that lived over 20 years: What kind of cat food did you feed your cat?

Food, environment, and genetics is everything when it comes to health.

For all the people who’ve had a cat live over age 20: I am curious what you fed your cat.

My cat is 20 and half her life has been lived on Natural Balance.

I am curious what others have fed their long-lived cats.

Please, no guesses. This is for people who really have known cats that have lived over 20 years.