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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.
Though in many jurisdictions an 18-year-old is considered an adult, IRS rules stipulate that you can claim a deduction for your child as long as she is younger than 19 at the end of the year. The year she turns 18, no matter if her birthday falls on January 1 or December 31, you can still claim her, as long as she meets all the other requirements for a deduction.