Hebian

Hebians (ヘビアン, Hebian) are a race of Human-like people that reside throughout Earth Land. They resemble Humans to a great extent, and most can pass for Humans and live among them for years, but there is one major difference. Hebians do not naturally age, and can control what age they appear. Hebains do not have any established communities that they've constructed specifically for themselves, and instead have integrated into Human society where most of them are treated like such. Because of their ability to control their appearance and most prefer to take on youthful forms, they have gained the nickname Ancient Children (旧い子供, Furui Kodomo).

Trivia

 * The name Hebian is based on Hebe, the Greek Goddess of Youth, whos Roman counterpart was Juventas.