Laws against age discrimination protect employees who over 40 years old from termination or other negative treatment on account of their age. Employees, former employees, or job applicants who have suffered retaliation or discrimination may file a retaliation complaint.Age Discrimination in Employment Act of 1967. Protects employees 40-65 years of age from discrimination. Age Discrimination is different treatment of an employee because he or she is over 40 years of age. California law, the Fair Employment and Housing Act, also prohibits employer discrimination against job seekers who are 40 years of age or older.