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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.
In many cases, you'll also lose the ability to claim them as a dependent on your tax returns. If your child is over 18, or over 23 if she's a full-time student, you can't claim her as a qualifying child any more. However, if you meet the criteria to claim your child as a qualifying relative, you can still claim her.