I might be an alarmist about this, but I think my Miss Kenzie (16 yrs now) is showing signs of aging fairly quickly. I've had trouble with her appetite since last summer, now her fur appears to be kind of separated "nappy" looking. I'm having difficulty in getting her to eat even her moist food now but desparate to keep her weight up. I bet if I were to get her some kitten dry food to add the carbs on she would gain and probably would eat it since it's easy to chew. Is there any reason why and elderly cat should not eat kitten food? What's the difference in the formulations from Sr. vs. kitten food? Thank you.