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Age discrimination is discrimination on the grounds of age. Although theoretically the word can refer to the discrimination against any age group, age discrimination usually comes in one of three forms: discrimination against youth (also called adultism), discrimination against those 40 years old or older, and discrimination against elderly people. In the United States, the Age Discrimination in Employment Act prohibits employment discrimination nationwide based on age with respect to employees 40 years of age or older. The Age Discrimination in Employment Act also addresses the difficulty older workers face in obtaining new employment after being displaced from their jobs, arbitrary age limits.