According to the website for the U.S. Equal Employment Opportunity Commission, the Age Discrimination in Employment Act of 1967 protects individuals who are 40 years of age or older from employment discrimination based on age. The ADEA's protections apply to both employees and job applicants. Under the ADEA, it is unlawful to discriminate against a person because of his/her age with respect to any term, condition, or privilege of employment, including hiring, firing, promotion, layoff, compensation, benefits, job assignments, and training.
It is also unlawful to retaliate against an individual for opposing employment practices that discriminate based on age or for filing an age discrimination charge, testifying, or participating in any way in an investigation, proceeding, or litigation under the ADEA.
The ADEA applies to employers with 20 or more employees, including state and local governments. It also applies to employment agencies and labor organizations, as well as to the federal government.
The website for the U.S. Equal Employment Opportunity Commission provides more information.
U.S. Equal Employment Opportunity Commission