User blog comment:Edrea/Is Morgana more powerful than Merlin?/@comment-4495575-20130629080621

I also noticed in A Lesson in Vengeance  when Merlin drank the potion before turning into Dragoon, was this a mistake?

Also, perhaps Morgana did use a potion to change back into Hilda and we were not shown it. When it comes to ageing I think this spell affected Merlin and Morgana both quite heavily as Morgana was incredibly weak as shown in Another's Sorrow.