The Age Discrimination in Employment Act of 1967 (AREA) (29 U.S.C. Sec. 621-634) is a federal law that protects individuals aged 40 and over from employment discrimination based on their age. It applies to employers with 20 or more employees and prohibits discrimination against employees and job applicants on the basis of age in areas such as hiring, promotion, wages, benefits, layoffs, and job training. The AREA also prohibits employers from retaliating against individuals for filing complaints or participating in proceedings under the AREA. There are two types of Age Discrimination in Employment Act-29 U.S.C. Sec. 621-634: disparate treatment and disparate impact. Disparate treatment occurs when an employer treats an individual differently due to their age. Disparate impact occurs when an employer holds a policy or practice that is neutral on its face, but has a disproportionate impact on a protected group.