Age Discrimination in Employment Act (ADEA)

The Age Discrimination in Employment Act turned 59 this year, and the underlying problem it was written to address has not gone away. Workers aged 40 and up still face bias in hiring, promotions, and layoffs, and the ADEA is the primary federal tool that addresses it. The law is narrower than Title VII in some ways (it only protects workers 40 and older) and broader in others (it reaches hiring, pay, training, and terminations). For HR teams, the ADEA is less about learning new rules each year and more about running an employment program that doesn't slip into age-based assumptions when headcount decisions get made.

What the ADEA Covers and Who It Protects

The ADEA applies to private employers with 20 or more employees, state and local governments, employment agencies, and labor unions. It protects workers aged 40 and older from discrimination based on age in every phase of employment: hiring, firing, pay, job assignments, promotions, layoffs, training, fringe benefits, and any other term or condition of employment.

The statute also prohibits retaliation against employees who file an age discrimination charge, participate in an investigation, or oppose unlawful practices. Retaliation claims under the ADEA follow the same framework as Title VII retaliation claims.

How Age Discrimination Cases Are Proved

The evidentiary standard is stricter than most employees realize. In Gross v. FBL Financial Services (2009), the Supreme Court held that ADEA plaintiffs must prove age was the but-for cause of the adverse decision, not just a motivating factor. That raises the bar for plaintiffs compared to some Title VII claims.

Cases generally come in two flavors. Disparate treatment involves direct or circumstantial evidence of age bias (comments about "new blood," statistical patterns in layoffs, stereotyping in performance reviews). Disparate impact involves a neutral practice that disproportionately harms older workers, such as a layoff selection criterion that consistently removes longer-tenured employees.

Does the ADEA Protect Against Younger-Worker Preferences Only?

Yes, at the federal level. The ADEA does not protect workers under 40, and it does not prohibit "reverse" age discrimination against younger workers. Some state laws are broader, but federal law limits protection to workers 40 and up.

Common ADEA Compliance Mistakes

Several patterns generate ADEA charges more than others. Layoff selection criteria that correlate with age (tenure, salary, technology fluency) without a documented business justification. Job descriptions with language like "recent graduate" or "digital native." Performance reviews that shift in tone after a worker crosses a tenure threshold. Comments from managers about retirement timelines, succession planning, or generational fit. The EEOC publishes guidance on each of these patterns and has pursued enforcement action against employers in all four categories.

The Older Workers Benefit Protection Act (OWBPA), which amended the ADEA in 1990, adds specific requirements for severance agreements that waive age claims. Employees must receive at least 21 days to consider the waiver (45 days in group terminations), a seven-day revocation period, and specific disclosure of the ages of employees selected and not selected for the program.

What the ADEA Means for 2026 Employee Relations Work

ADEA cases remain common enough that HR and ER teams should assume age is a factor that shows up across the employment lifecycle. The practical playbook: document legitimate business reasons for every termination, promotion, and pay decision; review job posting language for coded age signals; audit layoff selection criteria for disparate impact on the 40+ workforce; and run severance agreements through counsel to ensure OWBPA compliance.

Employee grievance procedures should explicitly welcome age-based concerns. Older workers sometimes hesitate to report concerns because of stereotypes that they're "complainers" or "out of touch." A clear, trusted reporting pathway through AllVoices' anonymous reporting tool gives employee relations teams early visibility and prevents small concerns from becoming EEOC charges.