Im wondering if Premium Cat food really makes a difference. I had 2 cats and fed them both meow mix their entire life, one lived to be 17 and the other lived to be 19 and he just passed away a few months ago. They both lived long healthy lives. They were always very active cats even in their senior years. I realize with premium food they usually dont use fillers/by products etc etc. But do you guys think the extra price on premium food is worth it?