User blog comment:OneofthePendragon94/The age of Merlin, Arthur, Morgana and Gwen./@comment-4283129-20121114161530

The age of the characters has always been an interesting topic among fans especially because you can only guess Arthur's age with some certainty. This is what I wrote on another site about a year ago when series 4 was broadcasted. "I think Arthur is the oldest of four and I believe he is around 26, seeing he turned 21 and made crown prince in "Excalibur" plus two missing years between series 2 and 3, and series 3 and 4. Seeing Balinor escaped Camelot after Great Dragon was imprisoned which was at the ending of the Great Purge, I'd say Merlin is at least a year younger than Arthur, so that would make him now around 25 or 24. Morgana was born after Arthur, Uther said so when he told Gaius about his affair with Vivienne and he told her that she was not around when the great purge happened, so that would make her more Merlin's age, 25 or 24 and I believe Gwen is of their peerage as well."