Considine sports a blonde wig and other make-up that ages his character up slightly over the first four episodes.
Alicent is one of the major characters from author George R.R. Martin's "Fire and Blood" book whose age was changed for the TV show.
Just like young Alicent, Rhaenyra is 14 at the start of the show and ages up to almost 18 years old over the course of the first four episodes.
By the time episode four of "House of the Dragon" made another jump ahead in time, Daemon should be around his early 30s.
When Insider asked actor Matt Smith and his costar Fabien Frankel about their ages, they both laughed and said together: "I couldn't tell you."
"Cole is in his early 20s, I would say very early 20s when we first meet him," Condal told Insider. "And then he ages into his late 30s."
The adult version of Alicent will also be in her late 20s, just like Cooke.Condal told Insider that a decision was made early on in production to have at least two actors play any character who starts out in the show as a child.
Fans have yet to see D'Arcy step into Rhaenyra's shoes, but when it happens you can see the more matured version of the heir to the Iron Throne.