Two legal aliens and their child immigrate to the United States as refugees. After years of working towards citizenship, the legal aliens attain citizenship through the naturalization process. The child is automatically granted citizenship if he is under the age of __________.

Under U.S. law, a child under 18 can automatically become a citizen when a parent naturalizes, provided the child meets the other legal requirements, such as living in the United States in that parent's legal and physical custody. Therefore, the correct answer is “under the age of 18.”

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