Definition: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Input: Passage: The son of a Union Army veteran of the American Civil War, Penn was born in Mattoon, Illinois and raised in Batavia, Ohio. He graduated from the United States Military Academy in 1886, and was a classmate and close friend of John J. Pershing. After graduation, he served in the Western United States as a member of the 13th and 2nd Infantry Regiments, and he was an 1891 graduate of the Infantry and Cavalry School, the predecessor of the Command and General Staff College. During the SpanishAmerican War, Penn served as a quartermaster officer at Camp George H. Thomas, Georgia and the Tampa mobilization point before contracting typhoid. After recovering, he was assigned to the Philippines, where he commanded 2nd Battalion, 34th Infantry. Penn's post-war assignments included service with the 7th Infantry in the Philippines, aide to General Henry Clark Corbin, and commander of provisional battalions in the 7th and 12th Infantry Regiments. He was a 1907 graduate of the Army War College, and during the Pancho Villa Expedition, Penn commanded the 3rd Infantry Regiment in Texas.
Link Information: General of the Armies John Joseph "Black Jack" Pershing (September 13, 1860 July 15, 1948) Answer: 26
Output:
How old was John Pershing when he graduated from the United States Military Academy?