When someone has the word "Ageless" in their bio, profile or carrd, etc. it means this person does not identify with their legal age. This can be because they don't wish their age to be public, or because they don't act like their age (older or younger is both possible, "mature" or "immature"). This is typically used by
neurodivergent people who also prefer to identify as
fictional characters, but not in a fictionkin or
delusional irl sense.