Cat Years?

You know ‘they’ say that 1 dog year is about the same as 7 human years? What is ratio for cats and humans? Also, how do they determine this?

I checked out “cats for dummies” (I was trying to figure out why my cats do something) from the library last week and it had this to say:

The ratio of human years to dog years is not 7 to 1, as Cecil explained, BTW.

Cool, thanks for pointing that out.