If you’re being treated differently at work because of your age, it is your obligation to report it to your employer so they will have the chance to investigate and correct the situation you’ve brought to their attention. If your employer does not fix the situation, or if the age-based harassment continues, you can file a charge of discrimination with the U.S. Equal Employment Opportunity Commission (“EEOC”) or your equivalent state anti-discrimination agency. If you resign or avoid this step, you may lose your ability to sue for discrimination.