Good Morning Mr. Thompson:
The employer cannot discriminate on the basis of age. The selective grand fathering of the this rule is likewise disturbing. You have recourse and I will outline it below.
VII of the Civil Rights
Act of 1964 protects individuals against employment discrimination on the bases of race, gender, age, nationality or religion. It applies to employers with 15 or more employees
Proving it is done by looking at pattern of conduct, document, witness statements, how other employees are treated, and the credibility of the employer and the complainant.
To file a complaint with the eeoc, see this link http://www.eeoc.gov/charge/overview_charge_filing.html
The "relief" or remedies available for employment discrimination, whether caused by intentional acts or by practices that have a discriminatory effect, may include: back pay, hiring, promotion, reinstatement, front pay, reasonable accommodation, or other actions that will make an individual "whole" (in the condition s/he would have been but for the discrimination). attorneys' fees, expert witness fees, a court costs.
You can further have local counsel pursue reinstatement or severance by negotiation either before filing the eeoc complaint or after doing so. You can find local employment counsel on www.martindale.com