otherage

Other-age is an identity defined by being chrono-peculiar due to nonhuman status. For example, someone may be ageless due to being an (otherkin) angel. Or, someone may adjust their age depending on dog years or similar circumstances. The same might apply to fictionkin, feeling that the character you kin has a more relatable age than your calendar one.

somber: I'm otherage, I identify as 2000 years old because I am an angel otherkin

loki: me too! i identify as 12 years old in puppy years!