I think she's 14 when she's married off. But all the kids in the book are too young for the things they do. Robb is 15 or 16, and Jon is about the same. Arya is 8. The show has aged them up appropriately. GRRM has said he should have made them older.
The dragons have not been a focus, but they are hanging around and growing up a little. Of course, now they have been stolen, and that did not happen in the books, so nobody knows for sure what will happen with them at this point on the show.
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