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.
Q: Passage: For seven years, Meyer was the Republican chairman of Dallas County; under his tenure the county became heavily Republican in orientation for two decades but reverted to Democratic majority strength in 2006. In 1972, Meyer was the campaign manager in the long-shot race waged by Alan Steelman, a young Republican who unseated Earle Cabell as U.S. representative for Texas's 3rd congressional district, a post once held by the earlier Republican Bruce Alger. Cabell was also a former mayor of Dallas. Steelman. however, gave up the seat in 1976 in a losing bid against Democratic U.S. Senator Lloyd M. Bentsen. In 1984, Meyer as chairman of the host committee worked to bring the Republican National Convention to Dallas. He lost a nonpartisan race himself in 1987 for mayor of Dallas to the Democrat Annette Strauss but became state chairman the next year for the first of three two-year terms. He helped Vice President George Bush win the presidency over Michael Dukakis, with their old mutual rival, Lloyd Bentsen, seeking to succeed Bush as vice president but losing out to Republican nominee Dan Quayle.
Link Information: Alan Watson Steelman (born March 15, 1942) Answer: 30
A:
How old was the man who unseated Earle Cabell at the time of his election?