They did up the ages lol. In the books, Rhaenyra is made heir when she's eight years old.
Dope episode. Felt like...well, Game Of Thrones S1. But without the sex. The plotting and scheming. I can imagine someone who prefers the latter seasons saying this was a boring ep but it was much needed set up. And clearly shyt pops off in episode 3. However I do think they should have taken some ques from GoT in terms of expanding things more, character wise. For instance Criston Cole, who will continue playing a role in the show, goes from being selected as the new KG to rounding up a mini army for the Hand Of The King. I def think it would have made sense to give him more scenes. Maybe a scene where we see him move into the White Sword Tower, where the KG reside. Perhaps a scene where he's challenged to a sparring match with a KG member to give the episode more action. Maybe he wins the fight, then faces off against the Lord Commander and gets whooped. Just to show the power dynamics.
Basically I think they need to expand this beyond just having scenes that feature Rhaenyra, Viserys, Otto, Corlys, and/or Daemon.