Is there an age requirement to open a brokerage account? February 24, 2020 18:12 Updated Follow Yes, you must be 18 years old. Related articles How do I open a Self-Directed invest account? Can I combine my Robo Invest and Self-Directed Invest accounts into one? Types of Investments with SoFi Invest Can I withdraw cash from my account if I have a debit balance? How often is the interest accrued and compounded?