Arion smiled as he saw how excited Zaros and Elidyr were to see him, and Lugia smiled as well, for in their expressions, she could see herself when she first saw Arion. Despite Arion being the oldest among them, he appeared much younger, a result of the difference in power between them.
In this world, some races are naturally long-lived. Dragons, elves of any ethnicity, vampires, and liquid spirits are among the longest-lived, though even within these, there are differences. Dragons are naturally the longest-lived, followed by the light elves.
Still, they are not immortal, so eventually, they too will meet death. However, there is a commonality even among humans—those with the shortest natural lives—that the stronger they are, the longer their lifespan.