Recruited from outside

I am 60 years old, and I was recruited from outside as a coding trainee for an Indianapolis Hospital and was promised that if I came to work for them that I would receive a $2000.00 sign on bonus and all the training necessary to become a certified coder. I never received the bonus and I never received the training because a new director of coding was hired and she told me that she was waiting to review me and send me to the right classes for what I needed. Now I and five other coders are being terminated and replaced by younger "certified" coders. We have been put on part-time and have been pulled from our jobs to do other work, and our employment will be terminated at the end of the year. I never received any formal training and I have never been reviewed. There is no law (federal or state) that says I must be certified to code. Is this discrimination?