I've noticed that single cats especially tend to go one way or the other. They're either very vocal, or not at all.
We have one that doesn't meow, but...squeaks. In ultra sonic ranges. It's very, very startling.
Haha, maybe she's just a quiet cat. It's just weird because she makes those weird noises now and then and I wonder if she's trying to meow. She's such a silly cat! :)
I have a tuxedo cat that never meowed until he was older. Right now he is 5 and occasionally will meow at me- maybe once a month or so. Even if you step on his tail (not like I try to-lol) he may turn around and hiss, but not meow. I have another 5 year old cat that meows enough for both of them.