Is it possible to re-open a divorce settlement after a 26 year marriage? My ex-husband has become a millionaire after agreement was signed. My alimony is minimal compared to his income. I am 58 years old and would like to receive some alimony until my death (currently, I receive it until I am 65). I live modestly and I am not looking for revenge, just peace of mind for my old age. Thank you.

While I hate to disagree with another attorney, I think you're going to be out of luck if you have a signed agreement in PA.  Certainly you can try to have it reopened if you were not aware of his income or there was some deception, but usually whatever changes occur after the divorce is final is not considered a marital asset.  I agree, however, that it would be worth discussing with a family law attorney to go over all the details.