Who can sign up for an account? October 12, 2020 20:04 The minimum age for opening a brokerage account is 18 years old and you must be a U.S. resident with a U.S. bank account. Related articles Are there any trading commissions or hidden fees? How much money do I need to start? Can I take my money out when I want? Can I lose money? What is Beanstox?