sometime in the late seventies or early eighties
March 15, 1960.
But all the major airlines already had company-imposed age limits of 60. The FAA just codified them into regulation.
I certainly understand your resentment. But understand that EVERY step in your career - the day you were hired, the day you upgraded, the day you went to the widebodies - happened five years earlier for you because of the old law.
Would you honestly choose to have your entire career timeline slid five years to the right?