HBO's adaptation of George R.R. Martin's "A Song of Ice and Fire" series has brought about manychangesto the source material. While this is natural for any television recreation, show fans may not always realize the reasoning behind specific alterations.
One major change the showrunners made was aging up all of the children by about three years.
This is small, but significant.
"Game of Thrones" is known for brazen violence, nudity, and heaps of emotional trauma. Knowing how young Martin originally penned these characters makes some show moments even more gut-wrenching.
In the pilot episode, Bran is pushed out of a window by Jaime Lannister, who hoped the young boy would die. In the books, Bran is only 7 years old.

In real life, the actor who portrays him, Isaac Hempstead Wright, was 11 at the time. Bran's onscreen character was introduced as 10 years old.

While attempted murder of a 10-year-old isn't much better, a 7-year-old seems more vulnerable.
In the same episode, we are introduced to Daenerys and Viserys Targaryen as outcast siblings. As Daenerys gets ready to bathe, Viserys molests her. In the books, Daenerys is 13 and her older brother is 22.

Since Targaryen siblings are also known to commit incest, Daenerys assumes she is going to marry her brother one day.
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