User blog comment:Emily Windsnap/How old are the Merlin characters?/@comment-1881345-20120504052724/@comment-5102537-20120721225554

It was not said that Morgause was smuggled out of Camelot during or because of the Great Purge. It's obvious that she is several years older than Morgana, so she can't have been smuggled out during the Great Purge which means that the Great Purge wasn't the reason. If she is Morgana's half-sister, Gorlois can't be her father. Morgause and Morgana must then be related through their mother.

It was stated by either an actor/and actress or by someone of the Merlin-staff that Morgana is older than Arthur. The time skip from season four to season five will be three years.

I'm not sure if Arthur turned only 21 in season one. Given that Uther had killed all the dragons 20 years ago as stated in season one, a little less than one year seems to be quite a short time for that. How long does it take to kill all the dragons and to capture the last one? Let alone that there can't have been dragons only in and around Camelot... to kill all of them around the world, it would take a lifetime, but actually, it would be impossible. Even only killing all dragons around Camelot would take much longer than just approx. one year. It's not that the horses can run as fast as airplanes fly today...