Let your power shine.... ~ An alternate situation: Celestia and Luna are the equivilent. And they ate the flower. Because they originally thought there'd only be two alicorns. Apparently not. And that is why their hair defies physics and gravity.
Oh. Man. Do I need to expain this?!? Ogh. All artifical( made by another Alicorn) alicorns aren't immoral. All natural alicorns ex, luna and Tia, are immortal. Hence Cadences aging in twilight flashback. There. Sry if this sound mean, but it's true!!
Mainly because I always had this theory that Equestria is post-Tangled civilization. Not only is Rapunzel's family line's symbol the same Sun sign as Celestia's cutie mark, but Tangled introduces a horse that is both capable of understanding human speech AND portraying human emotion/traits. Who's to say that Maximus' family line doesn't eventually grow to the point of human sentience and then take over the kingdom? And then takes on the symbol of the kingdom they conquered? HMMM?