Given the task definition and input, reply with output. 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.

Passage: Washington, D.C. was awarded an MLS franchise on June 15, 1994, which would play at RFK Memorial Stadium and later be named D.C. United. The league allocated U.S. defender Jeff Agoos, U.S. midfielder John Harkes, and Bolivian forwards Marco Etcheverry and Juan Berthy Suarez to D.C. United, which signed former University of Virginia Cavaliers coach Bruce Arena as its manager in January 1996. In the general player draft, D.C. was given the last pick and signed Salvadorian forward Raul Diaz Arce in the first round, completing a trio of South American attackers, and several starting players in later rounds. With its two picks in the college draft, United selected defender Eddie Pope in the first round and midfielder Jesse Marsch in the third round; in the supplemental draft, D.C. used its single pick on Argentine midfielder Mario Gori.
Link Information: Bruce Arena (born September 21, 1951) Answer: 45
How old was Bruce Arena when he became manager of D.C. United?