User blog comment:OneofthePendragon94/The age of Merlin, Arthur, Morgana and Gwen./@comment-4190137-20121115055714

More evidence shows that Morgana is older than Arthur. Because why would Uther was to have a child with another woman after the other one died the first time? - doesn't compute to me... And all of this couldn't have happened during the Great Purge, or after...

Anyway let's calculate Arthur's age first. The Great Purge ended 20 years before Series 1 meaning that it would have started one or two years before. That would make Arthur 21-22 as of Series 1. And there has been eight years between Series 1 and 5 so that would mean at the start of Series 5 Arthur would have been 29-30, and let's assume at least 6-9 months have passed from Arthur's Bane: Part One and the end of The Dark Tower, that would make Arthur currently 30.

Merlin would have been about 17-18 (John Hurt used the term 'young boy' - even in Series 3) at the start of Series 1. So now Merlin will probably be around 27.

And judging by Merlin's age in Series 1, I don't think Guinevere would have been far older. And I think she would be slightly younger than Arthur. I'm not so sure about Elyan if whether she's the older, younger is twin sister to him. And since she was a 'young' maid to Morgana in Series 1, it would probably have to mean she's younger than her. This is just a guess based on little evidence, I think Gwen is 29 currently.

Morgana, now, I said earlier that I think she is older than Arthur. But not much older... And since Morgana 'beat' Arthur in sword fights as a child I doubt any younger sibling would be able to do that. I think Morgana at the start of Series 5 was 31-32 but now as it is the middle of the Series, I am going to go with 31 or if not 32. And like Nimueh did, Morgana would have the ability to make herself look younger in appearance.

Gaius, I think was 75 in Series 1 so now I think he'd be 84. I think there is definitely a conspiracy behind why he's still on the show... Because no one in the middle ages made it past their late-fifties.

As for Mordred, I think he was about 9-10 in Series 1, 11 years old in The Nightmare Begins, just about 12 in The Witch's Quickening (guesses based on appearance). 20-21 in Arthur's Bane: Part One, so now he'd be 21.