We interview self-made millionaires from around the world. Many of these people have become millionaires in their 30s, 40s, or 50s. The most common path to becoming a millionaire is investing in stocks, buying rental real estate, starting a business, and entrepreneurship. They describe how they became millionaires, what habits helped them do so, and their sacrifices. Attaining millionaire status does not occur immediately. It takes time, effort, and money to do so.