Your employer hands the promotion you earned to someone less qualified. They pay coworkers with the same title more than you. They write you up or exclude you after you speak up about a workplace issue. Your employer is not just treating you differently; your employer is treating you unfairly. And now you wonder if it is more than office politics.

If you are wondering, “How do you prove age discrimination,” or “How to prove discrimination at work,” the answers start with understanding what qualifies as discrimination under Arizona and federal law. Knowing how to build a discrimination case based on evidence and a clear legal theory is key to withstanding scrutiny and getting justice.
At Shields Petitti & Zoldan, PLC, we have built a reputation in Phoenix for our tireless advocacy in discrimination cases. When employers overstep, we help employees push back. Whether your claim involves race, sex, disability, age, or retaliation, we know how to assess it and how to fight to win it.
What Is Discrimination Under Arizona and Federal Law
Discrimination occurs when an employer makes a decision, such as hiring, firing, promoting, paying, or assigning, based on a legally protected trait. These include:
- Age (40 or older),
- Race,
- Gender or gender identity,
- Sexual orientation,
- National origin,
- Religion,
- Disability,
- Pregnancy, and
- Genetic information.
In Arizona, employees are protected from discrimination under the Arizona Civil Rights Act and federally under Title VII of the Civil Rights Act of 1964, the Age Discrimination in Employment Act (ADEA), and the Americans with Disabilities Act (ADA). These laws apply to most employers with 15 or more employees, although 20 or more employees are required for age-based claims under the ADEA.
How to Prove Discrimination at Work
To prove workplace discrimination, you must show that an adverse action, like termination, demotion, or unequal pay, was tied to a legally protected trait such as race, gender, age, disability, or religion. The law requires more than feelings or assumptions of unfair treatment; it requires evidence. That could include suspicious timing of disciplinary actions, biased comments, different treatment compared to similar coworkers, or a sudden shift in performance reviews.
A successful case connects the dots between what happened, why it happened, and how your identity contributed to it. Without a clear link, even unfair treatment might not meet the legal standard for discrimination.
How to Prove Age Discrimination at Work
Let us be clear: Age discrimination is real, and it is more common than most people realize.
If you are wondering how to prove age discrimination at work, the law requires evidence that your age was a motivating factor in the adverse decision. That does not mean your employer needs to say it out loud. Juries can—and do—connect the dots through evidence of timing, unfair conduct, and inconsistent policies.
When it comes to proving age discrimination, here is what may support your claim:
- Comments about being “too experienced,” “slowing down,” or needing “fresh energy”;
- Replacement by a substantially younger employee;
- Sudden performance write-ups or demotions after years of positive reviews; and
- Pressures to retire or “make room for others.”
These patterns often appear after a company rebrands, restructures, or hires younger leadership. A single event may not prove discrimination, but a pattern backed by records, timing, and comparisons often does.
How to Prove Age Discrimination and Other Kinds of Bias: What Kind of Evidence Do I Need?
The most successful cases are built on well-documented facts. That includes:
- Emails, texts, or written comments that show bias or sudden shifts in tone;
- Employment records, such as evaluations, pay history, or awards;
- Comparative evidence, like how your employer treated different employees in similar circumstances;
- Witnesses who observed the treatment or overheard relevant remarks; and
- Company policies or HR documents that show how procedures were applied or ignored in your case.
A skilled employment attorney can help you uncover, preserve, and organize this evidence before anything is lost or destroyed. Unfortunately, time is not on your side: Arizona employees typically have 180 days to file a charge with the Civil Rights Division and 300 days for the EEOC. If you miss those deadlines, your claim may be disqualified.
Start with a Consultation, End with a Clear Strategy
If you are concerned about workplace discrimination, contact Shields Petitti & Zoldan, PLC for a confidential consultation. We do not chase headlines. We build cases that hold up in court. With decades of combined experience, over $25 million in verdicts and settlements, and recognition by Super Lawyers, Best Lawyers, and the Million Dollar Advocates Forum, our reputation is backed by results, not just claims.
Whether you face age discrimination, racial bias, or disability-based mistreatment, we approach your case with strategy, precision, and the credibility that comes from trying and winning complex employment disputes in Arizona courtrooms. We will evaluate your situation, examine your documentation, and answer questions like, How do you prove age discrimination? You deserve clarity and representation. And if your employer crossed the line, you deserve justice.