User blog comment:Morganamagic7/Siblings Age/@comment-24.1.4.229-20111216213242

Actually, Arthur is 20 during the first episode and turns 21 in episode 9 of the first season as it was tradition for knights to become of age at 21 back then as Arthur did in 9. As for Morgana's age, Capps has said in a panel I believe that Morgana is the oldest by only a few months i would assume. Reason: Uther did say that she was not around twenty years ago however, i assume he meant she wasn't old enough to recall when magic was prevelent in the kingdom.