Board Thread:General Discussion/@comment-27175367-20190508051927/@comment-37017073-20190520204117

I'm pretty sure Arthur's birthday is somewhere in autumn. It's been confirmed in commentaries and the like that his being sworn in as crown prince in Excalibur is his coming of age, so he's turning or has just turned 21 at the time of that episode, and the episodes that immediately follow it both have to do with the harvest: Ealdor's in The Moment of Truth and Camelot's in The Labyrinth of Gedref.

This is also supported by the fact that Arthur's birthday is also celebrated in The Wicked Day, which comes immediately after The Darkest Hour. During that episode Camelot had a feast celebrating Samhain, which is traditionally a festival marking the end of harvest and the beginning of winter. Historically, it was celebrated from October 31st to November 1st (halfway between the autumn equinox and the winter solstice) and the show appears to have stuck to this, as Alice Troughton refers to it as Camelot's equivalent of Halloween in the commentary for The Darkest Hour: Part 1.

Morgana's birthday is trickier, as the only time her birthday is celebrated is in The Crystal Cave. The only clue that episode gives us is that the plants in the Valley of the Fallen Kings are full and green, which tends to give me the idea that her birthday is somewhere in late spring/early summer.

As for her age, I tend to lean toward the view that she's older than Arthur, simply because it's the only way that her insistence that the throne is rightfully hers makes sense, but whether she's older by a few months (which is possible if her birthday is in spring/summer and his is in the fall) or by a year or two is open to interpretation.

Also, based on the fact that some of the last episodes of the show are concerned with the harvest and therefore presumably in the fall, I'd probably place the beginning of the show (The Dragon's Call) in early/mid spring, mostly because in Valiant it's still cold enough that the tournament spectators are all bundled up in cloaks and Morgana's wearing a fur collar and gloves. (Also, I can't picture Hunith sending Merlin off on a multi-day journey in winter.)