My boy is 16lbs. He just kept growing and growing.
He was 5lbs when I got him at 9 weeks old and I thought he was SOOO tiny. I was pretty ignorant and had NO idea that was the typical standard for an ADULT yorkie. lol. Well at least under 7lbs.
I personally LOVE his size. Of course I love the smaller guys too but I don't think I'll ever own a dog under 10lbs. Even at 16lbs, I sometimes worry about his small size, I can't imagine the worry I'd have with a 5lb dog. But he's very sturdy and able to handle a lot (with kids, bigger dogs, etc). And he's in great shape.