So, you don't work for the original company, correct? Given that you got s severance package, it seems like those 26 years are in the past. Did they actually re-hire you, or did a former boss start his/her own company and hire you?
As others have said, nothing you have written indicates any kind of discrimination, so I hope you are no longer claiming that.
Out of curiosity, I looked at your older threads. If you are in the same state as you were before, this is what I found:
Since you said that a payout was not specifically written i to your employment letter, it looks like you are legally out of luck.