Patchouli Knowledge: You know, Apollo Z. Hack's native universe?
Marisa Kirisame: Who the hell is Apollo Z. Hack?
Apollo Z. Hack: That would be me! In my native universe, a solar flare created a cataclism event that plunged my native Earth into chaos and dissray. Eventually, from the ashes of the old civilization came a new one, ruled by three kingdom. The Kingdom of Yahama was ruled by my universe's Hatsune Miku. The Kingdom of the United Northern Highlands was ruled by my universe's Haruhi Suzimiya. And the Kingdom of Kickassia was ruled by your counterpart from my universe. I was part of a elite unit of soldiers in the army of the Kingdom of Kickassia, serving under the commands of General Nostalgia Bison. When I activated my Revuer Unit, I unlocked incredible powers far beyond those of mere humans! C.P. Carmen was a member of the Kingdom of the United Northern Highlands, and when she-
Marisa Kirisame: Yeah, that's all very nice, but I'm really can't process it right now, since I'm still trying to comprehend the fact that the new universe has a music-themed superheroine that is based on "Jem and the Holograms", of all things.
"Adult" is just a word to describe physical maturity. The human body is said to be fully developed at 20 years of age. Not sure how this translates, as far as draconequi are concerned. We can only assume that Discord became an "adult" at some point in the course of his 1,000+ years of existence.