. . . . . "Sometimes being immortal or a member of a really long lived race means that you also have an eternal or really extended childhood or puberty. And that would really suck. On the other hand, sometimes fate can actually be merciful and aging occurs naturally or rapidly until a character physically reaches his or her mid-twenties, at which point their aging stops and they get to be young and beautiful forever, or at least a very long time. Examples of Immortality Begins At Twenty include:"@en . . . . . . . . . . . . . "Immortality Begins At Twenty"@en . . "Sometimes being immortal or a member of a really long lived race means that you also have an eternal or really extended childhood or puberty. And that would really suck. On the other hand, sometimes fate can actually be merciful and aging occurs naturally or rapidly until a character physically reaches his or her mid-twenties, at which point their aging stops and they get to be young and beautiful forever, or at least a very long time. This seems to be a common feature for elves, even if they aren't technically immortal and just long-lived. A character that's Younger Than They Look may fall under this if they weren't artificially created; sometimes a character looks like a teen or young adult but is only chronologically in the single-digits of age. Averted with certain types of Undead Child. See also Who Wants to Live Forever? and Immortality. Contrast Elderly Immortal, Really Seven Hundred Years Old. When this fails, you can have either Age Without Youth or Not Growing Up Sucks. Examples of Immortality Begins At Twenty include:"@en .