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: