 The ages in House of the Dragon are a little bit different. As was the case with Game of Thrones, the characters on the show are not the same ages as they were in the book. For example, in the book, Allison Hightower is 18 when she marries the 29-year-old King Viserys. And his daughter, Princess Rhaenyra, is about 8 or 9. In the show, Rhaenyra and Allison are both about 15, and Viserys, played by 48-year-old actor Patty Considine, is older as well. By the end of the season, Rhaenyra is 33 and her oldest child is 15. So are some of the relationships. One of the most revealing differences, but not necessarily changes between the book and the show, is that Allison and her future stepdaughter were friends in court. The book only talks about how they became rivals later in life.