the second bit is more formal, " You're six years old, aren't you?"
because, the other sounds very demanding or imperative, like as if you have to answer the question. so, it has to be the second line.
12 is A
13 is B
14 is B
15 is C
The plot of ‘Giver’ is Jonas a 12 year old boy who thought he loved in a utopian society where everything was perfect. As the novel goes further and further into the story we come to realize he lives in a dystopian society where (SPOILERS) everyone looses their memories.