Do I have a case if I and other co workers were discriminated against for being "old staff"

A new boss stated several times that it wasn't good having so many old staff/long term working in one place. She would always degrade staff and make threats of termination. She targeted long term staff for the entire time she has been employed with the company and actually pulled another supervisor in on the bullying so the staff were being teamed up against. They both definately fit the description of bullying bosses. I was recently fired for gross neglegence after following orders of another supervisor that went by policy.

placeholder text for bug in Chrome