New Haven, Connecticut:

Hopkins School, a private school, was founded in 1660 and is the fifth-oldest educational institution in the United States. New Haven is home to a number of other private schools as well as public magnet schools, including Metropolitan Business Academy, High School in the Community, Hill Regional Career High School, Co-op High School, New Haven Academy, ACES Educational Center for the Arts, the Foote School and the Sound School, all of which draw students from New Haven and suburban towns. New Haven is also home to two Achievement First charter schools, Amistad Academy and Elm City College Prep, and to Common Ground, an environmental charter school.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". In what year was Hopkins School founded in New Haven?
1660