When you enter your Dependents in the Personal Info section, TurboTax asks if your dependent is a full-time student for a dependent over age 19 to determine that they are an eligible dependent.
For a dependent under age 19, there is no need to ask this question.
You can still enter Education Expenses for either one of your sons in the Deductions & Credits section.
Click this link for more info on Dependents.
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