Board Thread:Episode Discussions/@comment-25319479-20150115114150/@comment-1751565-20150115225404

I don't think the Sand Siblings ever really became Chunin. They moved straight from Genin to Jonin and in Gaara's case Genin to Kage. The whole "Chunin Promo Age" thing in the Data book was prob just a tidbit to emphasise the age of their "promotions from anything higher than Genin". Thats how I always understood it.