User blog comment:Emily Windsnap/How old are the Merlin characters?/@comment-109.149.165.96-20140817230228

I think Arthur and Merlin are around the same age, give or take a couple of years. Series one, I'd place them early 20s, like Arthur's 'coming of age' ceremony  - must be early 20s. I know Bradley is several years older than Colin, so I always see Merlin as the younger of the two (Colin was the youngest of the cast until Alex Vlahos).

Gwen, I'm not sure - she seems older than Arthur in some ways, so I'd place her early to mid 20s in series 1, only a couple of years older, (Angel is older than Bradley and Colin by a few years anyway).

The knights: mid, to late-30s, Leon being the oldest, and probably Lancelot or Gwaine being the youngest when they join, that is until Mordred joins, who in the show is meant to be in his late teens/very early 20s (he is the youngest of the knights in the show, and the cast irl) - that is if you go by Asa-Mordred being like 10 in series 1, and you add up (give or take again) to series 5 being just under 10 years, roughly 8 years; Alex is only like 23 or 24 now.

Morgana does seem to hold an 'older' air to her, like a 'big sister' etc, so I'd place her mid to late 20s in series 1, 24 being the youngest I'd place her.

Series 5 is about 3 years after series 4 (which is a bummer cause I wish we'd have seen the kingdom grow), and if you add up a minimum or one or two years between each series (definitely a year between 2 and 3, cause Morgana is 'missing' for a year). So I'd say by the final series, Merlin and Arthur are at least approaching their 30s, if not already 30, and the others would then be placed around mid 30s.

This is just what I think anyway :) Based mostly around guessing, presuming, the actor's ages and being a nerd haha :P