http://www.uscis.gov/graphics/howdoi/fororphan.htm
請特別注意下列事項
Who is eligible to file an orphan petition?
A married U.S. citizen and spouse (no special age) or an unmarried U.S. citizen at least 25 years of age may file an orphan petition. The spouse does not need to be a U.S. citizen; however, the spouse must be here legally if living in the United States. To make the adoption process faster, you may apply for advanced processing before you actually find an orphan to adopt. An application for advance processing may be filed by anyone eligible to file an orphan petition. An unmarried U.S. citizen may file an application for advance processing if the U.S. citizen is at least 24 years of age and will be at least 25 when an orphan petition is filed on behalf of an actual child and when the child is adopted.