A millionaire (originally and sometimes still millionaire) is person whose net worth or wealth is at least one million units of a currency (most of the times it will be U.S. dollar). Millionaires are on average 61 years old with $3.05 in value. This includes things like the stock market or real estate, not just money. As of 2008, there were 10 million people in the world who are classified as U.S.-dollar millionaires. Another commonly used term is multimillionaire. This is used to call a persona having two or more millions of assets. In financial world the word multimillionaire is used to categorize person with $30 Million of assets or more. They are also called high net worth individuals.