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Age. You have to stop claiming your child when she turns 19, unless she goes on to become a full-time student. In that case, you keep claiming the exemption until she's 24, as long as she meets the other qualifying-child tests. After a child reaches age 24, you can only claim her if she's completely and totally disabled.
To claim a deduction as a dependent, your child or stepchild must be under age 19 as of the end of the tax year unless he is in school. If your child is a full-time student for a minimum of five months out of the year, he must be under age 24 at the tax year's end. Your child must live at your residence for over six months of the year to qualify for your deduction.