As everyone knows, Gon was twelve years old in 1999, when the main storyline of the original work officially began around late December, leading up to the upcoming Hunter Exam.
Le Eifu first came to full self-realization at the age of one, recognizing that the world she lived in was the Hunter x Hunter World and that she was a member of the Kurta Clan.
Then followed six years of lying low and developing in secret.
Chapter 78