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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.
Last Updated 29th September, 2015. You can reduce you total taxes owed by claiming a child as a dependent on your income tax return. But not all children qualify and age is a factor. In some cases, you can claim a child under the age of 19. In other instances, you can claim a child under the age of 24. And in still other scenarios, a child might not qualify at all â regardless of their age. Read on for more details about under what circumstance you can claim a child as a dependent on your income taxes.