I Have An Older Cat Who Wants To Eat All The Time, Is This Common?

No this isn't common once you see your cat that wants to eat a lot it is getting obese set a diet rule for it.Also once you hear your cat snore it means it has a breathing problem you must teach your cat not to eat that much.Also there types of diet it also important if they lack protein the might go blind make canned food is suggested.

An increased appetite is not normal.  Hyperthyroidism is a disease that causes cats to have a voracious appetite, often in the face of weight loss.  Have your veterinarian examine your cat and run screening blood work.