I’ve heard many people say that cats are really only cute when they’re kittens. Maybe true to some degree, but some cats definitely never lose that innocent kitten cuteness. One of our guys here, Cisco, is going on 15 years and still definitely knows how to pour on the cuteness. In my experience, cats often suddenly get more affectionate as they get older. Once they get above the 5 year mark or so, all of a sudden, they start doing things they’ve never done before.
Most cats are random-bred and I suspect yours is too. Most random-bred cats are described in America as domestic short hair, domestic medium hair, or domestic long hair; in Britain they describe all of these as “moggie.” When a shelter or a rescue says a cat is Siamese or Russian blue, they are simply saying that this cat, whose ancestry is unknown, most resembles the breed of “Siamese” or of “Russian blue.” This does not mean that these cats are of that breed.
It could very well be the first sign of something, a lot of times with cats the first sign is something seemingly innocuous. Does your cat go outside? Or hunt mice in the house? If so it could be worms. I also just learned that some bugs like cockroaches can transmit roundworms. How old is your cat? It could also be the start of thyroid issues. Sometimes it takes a while for cats to find their purr. We had a grey cat named Bill who never purred. Never. He obviously enjoyed being petted and being a lapcat, but he never purred.