Aetheryte

[Enkidoh]

No, there wasn't <_<

There was one brief encounter years ago where he was asked how the Scions stay looking so good and he somewhat off-the-cuff jokingly said "Sharlayan cosmetics!"

That's it.

Indeed, also I think there is a bit of confusion here with a reply Ferne actually made during the first Fanfest (at the Lore Panel) where it was asked how Kan-E-Senna looked older than the other padjal, and that was the answer given (she uses magic glamour to appear older as she believed the other citystates would not take her seriously as the head of state of Gridania if she looked like a child) has a similar context to the apparent age-defying properties of the Archons.

So yeah, I don't believe it was ever confirmed the Archons were using glamour magic to keep themselves looking younger than they were, only Kan-E-Senna.

[Keever]

a reply Ferne actually made during the first Fanfest

Of Kan-E-Senna, Ferne only says she is "making herself up" (video here) to look older. No explicit mention of magic here either. Could just be cosmetics.