Gint's lifetime or when the Rules of Acquisition were first created was never mentioned on-screen. However, in "Little Green Men", it is stated that it "took [ten thousand years] to establish the Ferengi Alliance", which might imply Gint lived around 8000 BC, if he is considered the founder of the Alliance.
In 2372, Quarkdreamed that he met Gint at the doorway to the Divine Treasury, where Gint told him that his life was more important than fulfilling a contract. Gint argued that the Rules were actually supposed to be nothing more than guideposts. (When asked why he decided to call them "Rules", Gint countered, "Would you buy a book called Suggestions of Acquisition?")
In his dream, Quark visualized Gint as resembling his brother Rom. (DS9: "Body Parts")