User blog comment:GianG/Merlin characters ages/@comment-90.201.59.133-20150331214552

As a matter of fact Johnny Capps said in an interview Morgana is the oldest, then its Arthur, then Merlin and Gwen is the youngest. If you go back to series one it is very true that Merlin and Gwen seem very much younger than Arthur and Morgana, so I would say the above is pretty accurate.