How old do I have to be to open a Manzil Invest account? October 18, 2022 18:23 In this article: You need to be 18 years of age to open a Manzil Invest account. Related articles How do I close a Goal? Creating a Manzil Invest Account How do I close my account? What does ADJUSTMENT mean in my transaction history? What is a Custodian Institution?