Don't give up!
Age and kidneys
Cats without a home
If you work full-time or if you aren't home so often as you'd like to be and want an indoor cat, it is recommended that you have two, to give them the company of each other. If a cat is left alone a lot, it will be less happy and a less happy cat, just like humans, will be an easier target for diseases. Of course this is something that differs among individuals both regarding cats and humans and some want more company than others.
Some breeds enjoy each other's company more, which also can be said concerning different breeds of cats and dogs, but this is also a matter of individuals of course. Ask the breeder of the cat or dog for advice.