Flyboyike,
Not true, there was a "non-retroactivity" section in the law; once past 60, no going back. They didnt come back because they couldn't. Your naming it, "seniority grab" implies they changed the law, THEY DID NOT, got it? The ICAO rule changed it, PERIOD.
As somene noted, don't like the change Congress passed, go elsewhere in aviation-overseas, corporate, whatever.