The Age Discrimination in Employment Act (ADEA) prohibits all public employers and private employers with 20 or more employees from discriminating against employees or applicants based on age. Individuals must be at least 40 years of age to be covered by the ADEA. Harassment of employees based on age is also unlawful discrimination. The ADEA also protects an older worker's disability payments, retirement incentives, life insurance, pension, and retirement plans. Amendments to the ADEA set out standards for waivers of legal rights by older employees in return for retirement incentives. Many states also have fair employment laws that prohibit age discrimination. Different age groups may be protected under state law, and smaller employers may be subject to state requirements.