User blog comment:GianG/Merlin characters ages/@comment-121.220.91.194-20141104121548

Here's my list:

Series 1

 * Merlin: 18
 * Arthur: 19
 * Morgana: 21
 * Mordred: 11
 * Gaius: 71
 * Uther: 46
 * Gwen: 19

And then there is a 7.5 year time gap between Series 1 and 5...