Age Discrimination Defense: What California Employers Need to Know About ADEA and FEHA Claims

Age discrimination claims are among the most common, and most misunderstood, employment disputes California employers face. Because these cases rarely involve a supervisor announcing that someone is being fired for being too old, the legal battle is almost always fought on circumstantial evidence: patterns, comparators, the language used in performance reviews, and the timing of adverse decisions relative to protected characteristics.

California's legal framework for age discrimination is more expansive than federal law in several important ways, and understanding the gap between the two systems is essential for building an effective defense. Here is what every California employer needs to know before an ADEA or FEHA age discrimination claim goes to court.

How FEHA and the ADEA Differ: What California Employers Are Actually Defending Against

Both the federal Age Discrimination in Employment Act (ADEA) and California's Fair Employment and Housing Act (FEHA) prohibit adverse employment actions against workers aged 40 and older. But the two laws operate differently, and those differences shape everything about how a defense is constructed.

Coverage threshold: The ADEA applies to employers with 20 or more employees. FEHA applies to employers with only five or more. Small and mid-size California businesses that might believe they're outside the scope of federal age discrimination law are almost certainly covered by FEHA.

Causation standard: This is the most important practical difference. Under the ADEA, the employee must prove that age was the but-for cause of the adverse decision, meaning age was the determinative factor, not merely one of several. This is a relatively high bar established by the U.S. Supreme Court in Gross v. FBL Financial Services (2009). Under FEHA, the standard is lower: age only needs to be a substantial motivating factor in the decision. Age doesn't have to be the only reason, just a genuine and significant one. That distinction makes FEHA claims meaningfully easier for employees to pursue and harder for employers to defeat on summary judgment.

Damages: FEHA allows recovery of emotional distress damages and attorney's fees that are not available under the ADEA in the same form. California claims often carry higher settlement value and jury exposure as a result.

Perceived age: In May 2025, the California Civil Rights Department issued a formal fact sheet clarifying that FEHA's protections extend to employees whom an employer mistakenly believes to be 40 or older. A termination decision based on the perception that someone is an older worker, even if that perception is wrong, can constitute actionable age discrimination under California law. This is a significant and underappreciated expansion of the statute's reach.

What Plaintiffs Must Prove to Make a Prima Facie Case

Understanding the employee's burden of proof is the starting point for building any defense. Under FEHA and CACI 2570, the employee must establish four elements to make a prima facie case of age discrimination:

•        They were 40 or older at the time of the adverse action.

•        They suffered an adverse employment action: a termination, demotion, reduction in pay, failure to promote, or materially altered working conditions.

•        They were performing their job satisfactorily at the time of the adverse action, or were qualified for the position they were denied.

•        The adverse action occurred under circumstances that give rise to an inference of discriminatory intent, such as being replaced by or passed over in favor of a substantially younger person, or statistical evidence suggesting the employer's decisions disproportionately disadvantaged older workers.

If the employee establishes this prima facie case, the burden shifts to the employer to articulate a legitimate, non-discriminatory reason for the action. If the employer does that, the burden shifts back to the employee to show that the stated reason is pretextual. This burden-shifting framework, adapted from McDonnell Douglas, defines the structure of most FEHA age discrimination cases at the summary judgment stage.

The Pretext Problem: Where Age Discrimination Cases Are Won and Lost

Most California age discrimination claims don't hinge on a smoking-gun statement or an explicitly age-based policy. They hinge on pretext: the argument that the employer's stated reason for the adverse action is not the real reason, and that the actual motive was age-based bias.

Employers lose age discrimination cases on pretext when their stated reasons are inconsistent or shift over time, when younger employees who engaged in the same conduct were treated differently, when the adverse action followed suspiciously close to an age-related comment or event, or when the documentation used to justify the decision appears to have been assembled after the fact rather than recorded contemporaneously.

Coded language is a particular vulnerability. Performance reviews that describe an older employee as lacking 'energy,' 'fresh ideas,' or 'digital-native instincts' can be read as age-coded even when the author intended no discriminatory meaning. Email exchanges that reference an employee's age, retirement plans, or how long they've been with the company, in contexts unrelated to legitimate HR analysis, become exhibits in litigation.

A skilled workplace discrimination defense attorney will analyze your entire documentation record before litigation begins: performance reviews, disciplinary history, manager communications, and comparator data for similarly situated younger employees. The goal is to build a coherent, consistent narrative around the legitimate business reason before the plaintiff's attorney has the opportunity to pick apart inconsistencies in discovery.

Defending Age Discrimination Claims in Reduction-in-Force Situations

Reduction-in-force (RIF) cases represent a significant category of age discrimination claims in California. When a company lays off workers and older employees are disproportionately affected, the statistical pattern alone can create an inference of discrimination, even when no discriminatory intent existed.

California courts have been clear that an employer's right to downsize does not include the right to use a RIF as an opportunity to eliminate older workers. The fact that positions are genuinely being eliminated doesn't resolve whether age influenced the selection criteria. For employers, that means the selection methodology for a RIF needs to be documented, objective, and auditable before a single termination notice goes out.

Defensible RIF selection criteria typically include objective, measurable factors: documented performance metrics, specific skill requirements tied to the post-RIF business structure, tenure-neutral factors, and criteria applied consistently across all employees in the affected unit. When selection decisions are made informally or based on subjective assessments by individual managers, the risk of a discrimination claim increases substantially, even if the actual intent was neutral.

Under the ADEA, employers facing disparate impact challenges to a RIF selection policy have the Reasonable Factor Other than Age (RFOA) defense available. If the policy is facially neutral and based on a reasonable factor unrelated to age, such as a legitimate skills assessment or objective performance ranking, that defense can defeat a disparate impact claim even if older workers were statistically more affected.

Supervisor Conduct and Stray Remarks: Managing the Evidence Employers Can't Unsee

One of the most consistent sources of liability in age discrimination cases is informal supervisor conduct that never makes it into official HR records until it surfaces in discovery. A manager who makes comments about an employee being 'close to retirement,' asks about someone's plans 'for the next phase of life,' or jokes about an older worker's inability to keep up with technology has created an evidentiary problem that no performance improvement plan can fully cure.

Courts distinguish between stray remarks, which are isolated comments not directly tied to the adverse decision, and evidence of discriminatory intent, which includes comments made by decision-makers, close in time to the adverse action, or reflecting a pattern of age-related bias. Whether a comment is a stray remark or something more significant is a fact-specific question that juries often resolve against employers.

Training managers and supervisors on what not to say is one of the most cost-effective steps an employer can take to reduce age discrimination exposure. So is establishing a clear protocol for who participates in employment decisions affecting protected-class employees, and ensuring that decision-makers document their reasoning in terms tied exclusively to legitimate business factors.

If your management team hasn't had employment law compliance training recently, or if you're concerned about how a supervisor's conduct might look in litigation, reaching out to an employment law defense attorney for a proactive review is worth the investment before a charge is filed rather than after.

What to Do When an Age Discrimination Claim Is Filed

Whether the claim arrives as an EEOC charge, a complaint with the California Civil Rights Department, or a lawsuit, the immediate steps matter enormously.

Preserve everything. Litigation holds should go out immediately to anyone who supervised, evaluated, or made decisions about the affected employee, as well as to HR and any comparative employee records that might be relevant. Destruction of potentially relevant evidence, even unintentional, can result in sanctions that make your defense significantly harder.

Don't let managers react. Informal communications about the claim, between supervisors or between supervisors and the former employee, can create additional liability. All communication related to the charge should be routed through your legal team.

Assess the comparator record honestly. The single most important factual question in most age discrimination cases is whether similarly situated younger employees were treated the same way. If they were, document that clearly. If they weren't, you need to know now, before discovery puts it in front of a jury.

At Brereton, Mohamed, & Korte LLP, our workplace discrimination defense attorneys represent California employers facing ADEA and FEHA age discrimination claims across Santa Cruz, Santa Clara, San Mateo, Alameda, and San Francisco Counties. We work to build a defense strategy grounded in the actual facts of your case. Call 831-429-6391 to schedule a consultation.

Frequently Asked Questions

Q: What is the difference between the ADEA but-for standard and FEHA's substantial motivating factor standard?

Under the federal ADEA, established by the U.S. Supreme Court in Gross v. FBL Financial Services (2009), an employee must prove that age was the but-for cause of the adverse employment decision: the determinative factor that made the difference. Under California's FEHA, the employee only needs to show age was a substantial motivating factor, meaning a genuine and significant reason, not necessarily the sole or primary one. This lower threshold makes FEHA claims easier to pursue and survive summary judgment, and it's why most California age discrimination cases prioritize the state law theory over the federal one.

Q: Can an employer be liable for age discrimination if the decision-maker didn't know the employee's age?

Generally, knowledge of the employee's age by the decision-maker is an element of an intentional discrimination claim. However, California's May 2025 Civil Rights Department guidance clarified that FEHA's protections also extend to perceived age discrimination: an employer who takes adverse action based on the mistaken belief that an employee is 40 or older can be liable under FEHA even if the assumption was factually incorrect. This perceived-age theory means employers need to be careful not just about actual age but about any age-related assumptions that influence employment decisions.

Q: How should employers approach layoffs to reduce age discrimination exposure?

Document the selection methodology before any terminations are announced. Use objective, measurable criteria tied to legitimate business needs, and apply them consistently across all employees in the affected group. Avoid criteria that are vague or highly subjective, since those tend to track unconscious bias rather than genuine performance. Before finalizing the list, audit the age distribution of affected employees compared to those retained. If the data shows a statistically significant impact on workers over 40, that's a signal to review the selection criteria with an employment law defense attorney before the RIF is executed.

Q: What is the Reasonable Factor Other than Age (RFOA) defense?

The RFOA defense is available under the ADEA to defeat disparate impact claims, which argue that a facially neutral policy disproportionately affects workers 40 and older. If the employer can show the challenged policy is based on a reasonable factor genuinely unrelated to age, such as objective performance metrics, specific skill certifications, or a documented business reorganization plan, the RFOA defense can defeat the disparate impact theory even when older workers were statistically more affected by the policy. This defense is not available for intentional disparate treatment claims, only for neutral-policy impact challenges.

Q: Can coded language in performance reviews create age discrimination liability?

Yes, and it does so more frequently than employers expect. Language describing an older employee as lacking 'energy,' 'adaptability,' 'fresh perspective,' or 'digital-native skills' can be read as age-coded by a jury, particularly when it appears in documentation that predates an adverse action. Even without a direct reference to age, a pattern of language that tracks age-related stereotypes can support an inference of discriminatory intent, especially if younger employees with similar performance profiles were evaluated more favorably. Training managers to document performance in objective, behavior-specific terms rather than subjective impressions reduces this risk significantly.

Q: How long does an employee have to file an age discrimination claim in California?

Under FEHA, an employee must file a complaint with the California Civil Rights Department within three years of the alleged discriminatory act. After receiving a right-to-sue notice, they have one year to file a civil lawsuit. Federal ADEA claims must be filed with the EEOC within 300 days of the discriminatory act in California, which is a dual-filing state. Because employees can pursue both federal and state claims arising from the same conduct, the practical statute of limitations for employer liability extends well beyond the initial termination or adverse action, which makes comprehensive record retention policies essential.

Q: What is the role of statistical evidence in age discrimination cases?

Statistical evidence is particularly significant in reduction-in-force cases and disparate impact claims. If an employer's layoff selection criteria, applied to the affected workforce, results in a statistically significant overrepresentation of workers 40 and older among those terminated, that pattern can support an inference of discrimination or a disparate impact theory even without direct evidence of intent. Employers defending against statistical evidence need their own analysis: data showing that the selection criteria were objective, consistently applied, and tied to legitimate business factors rather than correlated with age. Having an employment law defense attorney involved before a RIF is executed gives you the opportunity to identify and address statistical vulnerabilities before litigation begins.