I was wondering when a cat should be fed the senior food. I saw a bag of cat food the other day and it said for cats 7+. My cat is six, so she isn't there yet, but I thought that 7 was still a bit young. I thought you don't start feeding senior food until they are at least ten. I'm not sure. The brand was Science Diet, so I've heard it was a good bvrand, but is it really neccessary to feed senior food when they are less than ten?