According to the breeder I recently got my female persian from, she has not had her first heat yet. I know Persians in particular mature later than most breeds, but I've never heard of one being quite so long. It makes me wonder if there could be some other underlying reason for this. She's rather small, only about 6 lbs. Which I guess isn't too unusual. I'm really just grasping at straw here. Has anyone heard of any specific reasons this could happen or is it relatively common?