The nation's high court agreed Monday to decide whether the tiny Mount Lemmon Fire District -- and any other small government employer -- is exempt from age-discrimination laws. In a brief order, the U.S. Supreme Court said it wants to hear arguments by the district that it cannot be sued by two fire fighters who were let go by the district in 2009. At the time they were the department's two oldest employees. Monday's order is at least an interim victory for the fire district, which had failed to convince the 9th Circuit Court of Appeals that the federal Age Discrimination Employment Act applies only to employers who have 20 or more workers. The district had 13 at the time.