Somewhere between the birthday cards that joke about being over the hill and the job posting that asks for a “digital native,” a lot of workers past 40 start wondering the same thing: at what point does this become illegal? The answer has been on the books since 1967, and it is more specific, and more limited, than most people assume.
The Age Discrimination in Employment Act, enforced by the U.S. Equal Employment Opportunity Commission, protects applicants and employees who are 40 years of age or older from employment discrimination based on age. Knowing exactly what it covers, who it applies to, and how short the filing window is can be the difference between a case and a missed deadline.
Who the law protects, and which employers it binds
The protection starts at age 40 and has no upper limit. Workers under 40 are not covered by the federal law, and, a point that surprises people, it is not illegal under the ADEA for an employer to favor an older worker over a younger one, even when both are over 40. The law runs in one direction.
Coverage on the employer side has a threshold: the ADEA applies to private employers with 20 or more employees, along with state and local governments, employment agencies, labor unions, and the federal government, as laid out in the statute itself. If you work for a 12-person company, the federal law does not reach your employer. Many states set lower thresholds in their own age discrimination laws, some covering employers with a single employee, so a small-company worker should check state law before concluding nothing can be done.
The decisions the law reaches
The ADEA forbids age discrimination in any term, condition, or privilege of employment. Per the EEOC’s fact sheet on age discrimination, that includes:
- Hiring and firing
- Layoffs and recalls
- Pay, benefits, and job assignments
- Promotions, training opportunities, and any other condition of employment
Harassment is also covered when it is severe or frequent enough to create a hostile work environment; offhand teasing about age generally is not, but a pattern of it that affects your job can be. Job ads and recruiting practices that state or signal age preferences or limits are generally unlawful too. And the law protects the complaint itself: retaliation against someone for filing a charge, testifying, or otherwise participating in an ADEA investigation or proceeding is separately illegal.
What the law does not require is fairness in general. An employer can lay off an expensive, experienced worker for genuinely cost-based or performance-based reasons. The legal question is whether age itself drove the decision, and proving that usually rests on comparisons, comments, patterns in who was cut, and shifting explanations.
The deadline is shorter than people think
This is the part that quietly kills otherwise valid claims. Before suing under the ADEA, a worker must file a charge with the EEOC, and the charge must generally be filed within 180 calendar days of the discriminatory act. The window extends to 300 days if a state or local agency also enforces an age discrimination law covering the situation, which is the case in much of the country, but the safe assumption is the shorter one.
The clock runs from the act, not the consequences. If you were told in January that your position is being eliminated, the deadline generally counts from the notification, even if your last day came months later. Workers who spend a year job hunting before deciding to pursue the layoff usually discover the window closed long ago.
Filing is free and does not require a lawyer. Charges can be started through the EEOC’s public portal, by phone, or at a field office, and federal employees follow a separate, faster process that begins with an agency EEO counselor within 45 days.
Severance papers have their own age rules
Laid-off workers over 40 get one extra protection worth knowing before signing anything. When an employer asks a worker to waive age discrimination claims in exchange for severance, the waiver is only valid if it meets conditions Congress added to the ADEA in 1990: it must be in writing and understandable, specifically mention ADEA rights, advise the worker in writing to consult an attorney, and give the worker at least 21 days to consider it, with 7 days to revoke after signing. In group layoffs, the consideration period stretches to 45 days and the employer must disclose the ages and job titles of who is being let go and who is staying. If a severance agreement landed on your desk with a same-day signature request, that alone is a red flag.
The realistic playbook
If you believe age is driving decisions at work, the practical steps are unglamorous: write down dates, comments, and names while memory is fresh; keep copies of reviews and emails at home, within your employer’s policies; compare how younger colleagues in the same situation were treated; and mind the 180-day clock above everything else. Talking to the EEOC does not commit you to anything, and it stops the deadline problem before it starts. The law will not make an employer value experience, but it does make age an illegal reason, and the paper trail is what turns that from a principle into a case.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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