The “age of master” depends on the context. For a boy’s title, the term “Master” is typically used until around 16 to 18 years old before transitioning to “Mr.”. For an academic degree, students can complete a master’s at various ages, with common ages being in the early to mid-twenties, though many older individuals also pursue master’s degrees after gaining work or life experience. In the context of athletics, the “Masters” category begins at age 35 and older.Â