The average age of a millionaire varies depending on several factors, including location, education, career choices, and financial habits. However, globally, the average age of a millionaire tends to be around 60 years old. In the United States, the age distribution of millionaires is more specific, with most falling within the 60 to 79 age range. The average age for female millionaires in the U.S. is 58.5 years. At the same time, men reach millionaire status, on average, at 59.3 years old.