I currently have two oldsters which means I have to be particular about what I feed them. They both eat Science Diet K/D kibble. (Technically, it's the younger of the two that needs this because he has kidney insufficiency so we are trying to, hopefully, keep him from or at least delay CRF (chronic renal failure.) My eldest (19!) also gets Wellness wet food. Our vet recommended it as a high quality food, and this kitty has always been slight but she is especially skinny as an oldster. She particularly likes the "morsels" and "gravies" packets so whatever she likes to eat - and however much she wants to eat - she gets!