User blog comment:Emily Windsnap/How old are the Merlin characters?/@comment-80.7.103.140-20141202011547

Mordred might have been 9-10 in series 1, and Merlin was 18-ish. So by series 5, Merlin is 23-24 and Mordred is the baby of the knights at 17-18. Arthur is 26-27 Morgana might be between Merlin and Arthur Gwen seems to be slightly older than even Arthur at maybe 28 by series 5 Gaius in his seventies, which is saying something for the middle ages.