The term 'AGE IN US STATE PRISON' can be summarized by two crossword solutions: ATTICA (6 letters) and MEAD (4 letters). ATTICA is a reference to the Attica Correctional Facility in New York, which is one of the oldest and most notorious prisons in the United States. MEAD is a reference to the Washington State Penitentiary in Walla Walla, Washington, which is the largest prison in the state. Both of these prisons are known for their long sentences and harsh conditions.