It has grown tremendously and doubled its staff as a result of a few recent major transitions. I brought up the matter with my immediate supervisor and asked if my lower pay is because I am a woman, or because I am over 40. I want to stay at this company, but feel I am not being treated fairly.
Discrimination is illegal.
However, you cannot claim a charge of illegal discrimination merely because you feel that you are being treated unfairly. There may be a number of reasons why employers treat their employees unfairly, including poor management. Unfortunately, poor management alone is not illegal and cannot be a basis for a discrimination lawsuit. The remedy for an employee suffering under poor management is to find another job with a management structure that is more fair and open. Gather evidence of illegal discrimination before you charge someone with it.