ADEA Employment Law: Protections, Proof, and Filing Deadlines

The Age Discrimination in Employment Act, the federal statute usually shortened to ADEA employment law, protects workers who are at least 40 from being treated worse because of their age at any stage of employment.¹ It applies to private employers with 20 or more employees, state and local governments, labor organizations, employment agencies, and the federal government.² The rules that surprise people most sit at the ends of the process: the proof standard is tougher than under other civil rights laws, and the damages you can recover are narrower.

Who the Law Protects and Which Employers It Reaches

The ADEA covers anyone 40 or older, whether current employee or job applicant.¹ There is no upper age limit. A 75-year-old gets the same protection as a 41-year-old. Workers under 40 are not protected, even against being told they’re too young.

Private employers are covered when they have 20 or more employees for each working day in at least 20 calendar weeks of the current or preceding year.³ If your employer is smaller than that, the ADEA doesn’t reach them, but many states have age discrimination laws with lower thresholds — some as low as a single employee. That’s worth checking with your state civil rights agency before assuming you have no claim.

What the ADEA Prohibits

The statute makes it illegal for a covered employer to refuse to hire, fire, or discriminate in pay, job assignments, promotions, or any other term or condition of employment because of a person’s age.⁴ Employers cannot classify or segregate workers in ways that limit opportunity based on age, and they cannot cut anyone’s pay to close an age-based wage gap; the fix is to raise the lower wage.

Job ads and recruitment postings cannot state age preferences or limits.² Language like “age 25 to 35” or “recent college graduates” violates the law unless age is a legitimate job requirement.⁵ Benefits are covered too. Employers cannot cut health or retirement coverage for older workers just because they’re more expensive to insure.

Age-based harassment is prohibited when it’s frequent or severe enough to create an intimidating or hostile work environment, or when it leads to an adverse employment action like a demotion or termination. Isolated off-color remarks generally don’t clear that bar; a persistent pattern of derogatory comments or ridicule can.

The Narrow Exceptions

Two exceptions let employers make age-based decisions that would otherwise be illegal. Both are read narrowly.

The first is the bona fide occupational qualification. An employer can use age as a criterion when it is reasonably necessary to normal business operations, and the employer carries the burden of proving that.⁴ The clearest examples are public-safety roles like airline pilots, bus drivers, and certain law enforcement positions.

The second is mandatory retirement at 65 for a very narrow group of top executives and high-policymaking employees. It applies only if the worker spent the two years immediately before retirement in a genuine executive or high-policymaking position and is entitled to an immediate, nonforfeitable annual retirement benefit of at least $44,000 from the employer’s pension or deferred compensation plans.⁶ Middle managers, branch managers, and warehouse supervisors don’t qualify, whatever their pensions look like.

Proving an Age Discrimination Claim

Age discrimination is harder to prove than other kinds of workplace bias, and the reason is a single Supreme Court decision. In 2009, the Court held that a worker must prove age was the “but-for” cause of the employer’s decision, meaning the adverse action would not have happened if the worker had been younger.⁷ Under Title VII, showing that a protected trait was one motivating factor among several can be enough. Under the ADEA, age must be the reason, not just a reason.

Most claims are disparate treatment cases: the employer intentionally treated someone worse because of age. To get such a case moving, a worker generally needs to show four things — that they are at least 40, that they were qualified for the position, that they suffered an adverse action, and that the circumstances suggest age played a role. A long-tenured employee with strong reviews who is laid off and replaced by someone decades younger is the textbook fact pattern.

The ADEA also allows disparate impact claims that target neutral policies with a disproportionate effect on older workers.⁸ The employer’s defense is easier here than under Title VII: instead of proving business necessity, the employer only has to show the practice was based on a reasonable factor other than age.

Retaliation

The ADEA prohibits employers from punishing anyone who opposes age discrimination or takes part in an investigation or legal proceeding about it.⁴ Protected activity includes filing a charge, testifying as a witness, complaining to management, refusing an order you reasonably believe is discriminatory, or providing information during an internal investigation.⁹

You don’t need legal terminology to be covered. Telling your supervisor you think you were passed over for a promotion because of your age is enough. The protection stands even if your underlying discrimination claim doesn’t succeed, as long as you acted in reasonable good faith.⁹

What You Can Recover

A worker who wins an ADEA case can recover back pay for the wages and benefits they would have earned but for the discrimination. Front pay may cover future lost earnings when reinstatement isn’t practical, and courts can order reinstatement, promotion, or other equitable relief. When the employer acted willfully, meaning it knew or showed reckless disregard for whether its conduct violated the law, the worker can also recover liquidated damages equal to the back pay award, effectively doubling that portion of the recovery.¹⁰

Here’s the limit worth knowing before you file. ADEA plaintiffs cannot recover compensatory damages for pain and suffering, and punitive damages are not available at all. Those categories, which can add hundreds of thousands of dollars to a Title VII verdict, simply don’t exist in an ADEA case. Recovery is capped at economic losses plus liquidated damages when willfulness is shown. This is one reason many plaintiffs’ lawyers also pursue parallel claims under state law, where broader damages may be available.

Severance Agreements That Ask You to Waive ADEA Claims

If your employer offers severance in exchange for releasing age discrimination claims, the Older Workers Benefit Protection Act sets requirements the employer must meet, and any missing element makes the waiver unenforceable.¹¹

The agreement must be written in language you can actually understand.
It must specifically reference rights under the ADEA. A general release of “all claims” isn’t enough.
It cannot waive claims for anything that hasn’t happened yet.
You must receive something of value beyond what you were already owed.
The agreement itself must advise you in writing to consult an attorney.
You must be given at least 21 days to consider the offer, or at least 45 days if the waiver is part of a group layoff or exit incentive program.¹²
After signing, you have at least seven days to revoke, and the waiver doesn’t take effect until that period ends.

In a group layoff, the employer must also disclose the job titles and ages of everyone selected for termination and everyone in the same job classification who wasn’t selected.¹³ That disclosure exists so workers can see whether older employees were disproportionately cut. Incomplete data, or none at all, breaks the waiver. Pressure to sign before the statutory time period runs out is a red flag.

Filing Deadlines

Deadlines are the fastest way to lose an age case. You generally must file a charge with the EEOC within 180 calendar days of the discriminatory act. That extends to 300 days if your state has its own age discrimination law and a state agency that enforces it. If only a local ordinance covers age and there is no state law, the deadline stays at 180 days.¹⁴ Weekends and holidays count toward the total, though if the last day lands on one, you have until the next business day. In harassment cases, the clock runs from the last incident.

How to File and What Happens Next

Before filing, pull together the employer’s full legal name and address, the approximate number of employees, a chronological account of what happened, the dates of each incident, and the names of anyone involved or who witnessed the conduct. The charge is submitted on EEOC Form 5, the Charge of Discrimination.¹⁵ You can file through the EEOC’s online public portal, by mail, or in person at a field office.¹⁶ Fill every field. Gaps slow things down.

The EEOC notifies the employer within 10 days of receiving the charge.¹⁷ Mediation may be offered as a voluntary route; both sides have to agree. If mediation doesn’t resolve the matter, the agency investigates to decide whether there’s reasonable cause to believe the law was violated. Either way, at some point you’ll receive a Notice of Right to Sue.¹⁸ From the day you receive that notice, you have 90 days to file suit in federal court. Courts enforce that 90-day window strictly.

Federal Employees Follow a Different Path

Federal workers don’t file an EEOC charge the way private-sector workers do. A federal employee who has not already filed an internal complaint must give the EEOC at least 30 days’ written notice of intent to sue, and that notice has to be filed within 180 days of the alleged discriminatory act.¹⁹ After the 30-day period runs, the employee can file suit in federal district court. Many federal workers begin instead by filing an internal complaint through their agency’s EEO office, but exhausting the administrative process is not required before suing.

1
U.S. Equal Employment Opportunity Commission. Age Discrimination in Employment Act of 1967
2
U.S. Equal Employment Opportunity Commission. Fact Sheet: Age Discrimination
3
Office of the Law Revision Counsel. 29 USC 630 – Definitions
4
Office of the Law Revision Counsel. 29 USC 623 – Prohibition of Age Discrimination
5
U.S. Department of Labor. What Do I Need to Know About Age Discrimination
6
eCFR. 29 CFR 1625.12 – Exemption for Bona Fide Executive or High Policymaking Employees
7
Justia Law. Gross v. FBL Financial Services, Inc., 557 US 167 (2009)
8
U.S. Equal Employment Opportunity Commission. Questions and Answers on EEOC Final Rule on Disparate Impact and Reasonable Factors Other Than Age
9
U.S. Equal Employment Opportunity Commission. Questions and Answers: Enforcement Guidance on Retaliation and Related Issues
10
U.S. Equal Employment Opportunity Commission. Remedies for Employment Discrimination
11
Office of the Law Revision Counsel. 29 USC 626 – Recordkeeping, Investigation, and Enforcement
12
U.S. Equal Employment Opportunity Commission. Understanding Waivers of Discrimination Claims in Employee Severance Agreements
13
eCFR. 29 CFR 1625.22 – Waivers of Rights and Claims Under the ADEA
14
U.S. Equal Employment Opportunity Commission. Time Limits for Filing a Charge
15
U.S. Equal Employment Opportunity Commission. Selected EEOC Forms
16
U.S. Equal Employment Opportunity Commission. Filing a Charge of Discrimination
17
U.S. Equal Employment Opportunity Commission. What You Can Expect After You File a Charge
18
U.S. Equal Employment Opportunity Commission. What You Can Expect After a Charge Is Filed
19
Office of the Law Revision Counsel. 29 USC 633a – Nondiscrimination on Account of Age in Federal Government Employment