It is set up and managed by an adult, and turned over to the child when he or she reaches the age of majority. The Schwab One® Custodial Account Invest for a child’s future custodial account allows you to open an account in a child’s name and manage it, typically until the child reaches age 18 or 21 and takes full control of the account (or can be up to age 25, depending on state laws). A custodial account allows you to open an account in a child’s name and manage it, typically until the child reaches age 18 or 21 and takes full control of the account (or can be up to age 25, depending on state laws).