The Age Discrimination in Employment Act is the exclusive legal mechanism available to public college employees for claims of age discrimination, a federal appeals court ruled Friday in a case involving the Nevada System of Higher Education. The U.S. Court of Appeals for the Ninth Circuit upheld a lower court’s ruling that Linda Ahlmeyer, a former employee at the higher education system, could not amend her age discrimination lawsuit against the agency to include Constitutional claims once the state argued that it was immune from her ADEA lawsuit.