
I found the recent TV programmes about cats very interesting to watch, especially "Catwatch 2014". Without going into the old debate of indoors vs outdoors, the outdoor cats pretty much ALL had issues with other cats in the area, and it was claimed cats don't like company. They also showed a family with 4 cats, that the family believed got on well together but when filmed during the night it proved they were in fact not all that good friends. (Again these cats went out.) However, they then filmed a large number of feral cats on a farm, and found THEY got on great with each other and chose to stay close even though they had acres to roam about it, they reared kittens together etc, and it was somehow proven that the reason for this was that they were all related to each other, as cats can tell by scent if another cat is a relative. And relatives get on. That would explain why those of us who are breeders can have large numbers (dozens even) that get on just fine -although I have to add, that cats also tend to settle into colour groups and indeed the cats at this farm, were all red or tortie. I see this all the time here. The torties will be cuddled up together, the blues and lilacs together, the blacks together, the Colourpoints together etc. I have one lilac male, now neutered, who spends ALL his time with his lilac son and blue daughter, but will have nothing at all to do with his black daughter. Fascinating really. :)
Now if we were talking about indoor cats, I would say that chances are very slim that a 12 year old cat would like company after all this time as he will have got used to being on his own. But if you really wanted a kitten to get TWO, as they then play with each other and will ignore the "boring oldie". But I have no idea how adding the outdoor element into things will work as I have zero experience of that.