I have a rescued 13 yr old longhair cat who is a flu carrier - she sneezes a lot and often needs her nose wiping and dried snot combing from her fur
I also have a 14-15 yr old cat who survived two cancer ops last year, but it looks like he may have another tumour now and I don't think he'd survive another op as I suspect the last 2 have taken their toll on his heart but he's happy and well for now so we'll see how he goes.
Both are quite happy with a warm place to sleep and plenty of food and love!