The Cat Lives

How long to cats live for? I ask this because I have three and I think they are way too old. They are each over 10 and one might be close to 15. Anyway, we got these cats when we lived on the farm to help with the mice situation. When we moved back to the neighborhood, we brought them with us. They were mostly inside/outside cats. But, I just could not deal with the litter box and soon the cats were laying all over the place and dropping ticks all over my house. That was it. They were moved outside. Now, don't think I am mean. These were farm cats. We still bought them their Meow Mix. But I just couldn't have them in the house anymore. If you have ever been to my house, you know I have offered up the cats to any takers. ( so far none). The other day, Marlin, came out of the garage wobbly and unsteady. I didn't even notice it. Newell pointed out that there was something wrong with the cat. What to do? He called the vet and she thought maybe the cat had a stroke. Well, we don't want the cat to suffer. So the next morning we put him in a carrier and I took him to the vet's house so she could take him to the office and put him out of misery. Imagine my surprise, when she said the cat has an inner ear infection and would be fine. HMMM.. fine. Now, having one less cat around would have been ideal for me. The cats pee in my garage, often on Echo. Which is pretty sad. I was ( to be honest) very disappointed that the cat was going to fine. Now, I have to give him an antibiotic for 2 weeks. This cat I can barely get my hands on. Great. How long do cats live for?