To prove age discrimination in hiring, you have to show that your age was the reason an employer with at least twenty employees rejected you for a job you were qualified to do, and that the explanation the employer offers is a cover for that real reason. The federal Age Discrimination in Employment Act of 1967 protects applicants who are 40 or older, but it puts the burden of proof squarely on you.1U.S. Equal Employment Opportunity Commission. Age Discrimination in Employment Act of 1967 Employers rarely say the quiet part out loud, so the case you build is almost always assembled from documents, patterns, and comparisons rather than a smoking-gun admission.
The Four Things You Have to Establish
Courts use a decades-old framework for hiring discrimination claims. You start by proving four elements:
- You are 40 or older.
- You were qualified for the position, meaning you met the employer’s legitimate requirements.
- You were rejected despite those qualifications.
- The job went to someone substantially younger, or the position stayed open while the employer kept looking for candidates with similar qualifications.2Legal Information Institute. Age Discrimination in Employment Act (ADEA) – Section: Prima Facie Cases
Getting past those four is only the entry point. The employer then offers a non-discriminatory reason for the decision, and the burden shifts back to you to show that reason is pretext.
Age Has to Be the Decisive Factor, Not Just a Factor
In Gross v. FBL Financial Services, the Supreme Court held that an ADEA plaintiff must prove age was the “but-for” cause of the employer’s decision. The employer would not have rejected you if age were taken out of the equation.3Justia. Gross v. FBL Financial Services, Inc., 557 U.S. 167 (2009) This is a stricter standard than the “motivating factor” test that applies to race or sex discrimination under Title VII. Showing age played some role in the mix will not win an ADEA case. Everything you gather has to point toward age being the reason, not one reason among several.
Evidence That Actually Wins These Cases
Proof falls into two categories. Most winning cases are built almost entirely on the second one.
Direct Evidence
Direct evidence is an explicit statement tying the decision to your age. A hiring manager’s email saying the team needs someone younger. Interview notes calling a candidate “too old.” A recorded remark about your likely retirement timeline. Direct evidence requires no inference, which is why it is so powerful and so rare. Most employers know not to put bias in writing.
Circumstantial Evidence
Circumstantial evidence creates an inference of discrimination when the pieces are viewed together. Individually, no single item may decide the case; collectively, they can. The strongest categories:
- A qualifications gap. You had significantly more experience, education, or credentials than the younger person hired. The wider the gap, the harder it is for the employer to sell the decision as merit-based.
- Hiring patterns. The employer consistently fills similar roles with younger workers. A department of thirty with no one over 45 is worth documenting.
- Shifting explanations. The employer says the position was eliminated, then fills it a month later. Or the reason given during the interview does not match the reason given later. Inconsistency is a classic sign the real reason is being concealed.
- Age-coded language. Interview comments about being “overqualified,” questions about retirement plans, remarks about fitting in with a young team, or job postings using phrases like “digital native,” “recent graduate,” or “up to five years of experience.” On their own these are suggestive; combined with other evidence they become persuasive.
Automated Screening Tools
Software that ranks resumes or filters applicants before any human reviews them has created a new evidence category. If a tool uses inputs that correlate with age, such as graduation year or capped experience fields, it can produce discriminatory outcomes at scale. The EEOC settled one case for $365,000 involving recruiting software programmed to automatically reject female applicants 55 and older and male applicants 60 and older, screening out more than 200 people.4U.S. Equal Employment Opportunity Commission. Remedies for Employment Discrimination In Mobley v. Workday, a federal court allowed an age discrimination claim to proceed against the AI platform itself, holding that Workday’s tools plausibly performed a traditional hiring function by rejecting candidates at the screening stage.
If you suspect an automated tool eliminated you, note whether the application asked for graduation dates or used experience fields that flatten anyone above a certain number of years. Those details matter in discovery.
What to Save, and When to Start
Your case is only as strong as what you can put in front of a factfinder. Memory fades within weeks, and web pages disappear.
Save the original job posting the moment you apply, and again if you are rejected. Take a screenshot rather than relying on the link. Keep the resume, cover letter, and application you actually submitted so you can later show you met the stated requirements.
Preserve every communication with the employer: emails, texts, formal rejection letters, voicemails. When a conversation happens by phone or in person, write down what was said the same day. Include the date, who was on the call, and the specific words used. Courts weight contemporaneous notes far more heavily than recollections put together months afterward.
After the decision, find out who got the job. Professional networking profiles usually reveal experience level and roughly when someone started their career. You do not need an exact age. Showing the hire has fifteen fewer years of experience than you, or graduated college two decades later, does the work. That comparison is the fourth element of your case.
Anticipating the Employer’s Defense
Knowing what the employer will say helps you target evidence at the right rebuttal. The ADEA gives employers several defenses.5Office of the Law Revision Counsel. 29 U.S.C. 623 – Prohibition of Age Discrimination
- Bona fide occupational qualification. The employer argues age is genuinely necessary for the job. This defense is narrow and mostly succeeds only in safety-critical roles such as airline pilots or bus drivers. Customer preference does not qualify.
- Reasonable factors other than age. The employer says the decision turned on something else, such as a specific technical skill, a salary requirement, or a skills test. The employer has to show the factor was objectively reasonable and tied to the job. This defense applies only to disparate impact claims, not to intentional discrimination.6eCFR. 29 CFR 1625.7 – Differentiations Based on Reasonable Factors Other Than Age
- Good cause. If you previously worked for the company and are claiming a discriminatory refusal to rehire, the employer may point to legitimate performance issues from your earlier tenure.
In practice, most employers simply offer a non-discriminatory reason: the other candidate had a certification you lacked, interviewed better, or accepted lower pay. Your job is to show the reason does not hold up. If the “required” certification was never in the posting, or the person hired does not actually have it, that inconsistency undermines the defense. This is why saving the posting and researching the new hire matter so much.
Does the ADEA Even Cover This Employer?
Before investing weeks in evidence, confirm the employer is large enough to fall under the law. The ADEA reaches only employers with twenty or more employees for each working day in at least twenty calendar weeks during the current or preceding year, counting both full-time and part-time workers.7Office of the Law Revision Counsel. 29 U.S.C. 630 – Definitions Below that threshold, the federal statute does not apply, though state law may. The ADEA also covers employment agencies, labor organizations, and state and local governments. If you applied through a staffing agency or recruiting platform, the agency itself may be a covered entity if it has twenty or more employees.
Filing With the EEOC to Preserve Your Claim
You cannot go straight to court under the ADEA. You first have to file a Charge of Discrimination with the U.S. Equal Employment Opportunity Commission through its online Public Portal, by mail, or at a local office.8U.S. Equal Employment Opportunity Commission. Filing a Charge of Discrimination The charge only needs your contact information, the employer’s name and address, a short description of what happened and why you believe it was age-based, and the date of the decision.9U.S. Equal Employment Opportunity Commission. How to File a Charge of Employment Discrimination You do not need a lawyer to file, and you do not need your entire case built out at this stage.
The deadline is where people lose otherwise strong claims. You generally have 180 calendar days from the date of the discriminatory hiring decision to file. The deadline extends to 300 days only if your state has its own law prohibiting age discrimination in employment and a state agency that enforces it. A local ordinance alone does not extend it.10U.S. Equal Employment Opportunity Commission. Time Limits for Filing a Charge Miss the deadline and the federal claim is gone no matter how strong the evidence.
Filing also protects you from retaliation. A prospective employer that learns about your charge and pulls a job offer, or gives you a negative reference in response, has committed a separate violation.11U.S. Equal Employment Opportunity Commission. Questions and Answers: Enforcement Guidance on Retaliation and Related Issues
Where State Law May Give You More
Many state age discrimination statutes go further than the ADEA. Some cover employers with fewer than twenty employees. Some allow compensatory or punitive damages that federal law does not. A handful protect workers younger than 40. A claim that looks weak under the ADEA may be substantially stronger under state law, and both can often be pursued at the same time. Check what your state provides before deciding how to proceed.