Some of us, after our quite turbulent 35 years on the job, were terrified they would raise the age before we were able to retire. (Here is where some idiot suggests you "don't have to stay..").
In the real world, nobody who isn't independently wealthy walks away from an airline job with the majors. I retired at 60 10 years ago and am sooooo glad to be finished with the bankruptcies and mergers. Three airlines, two bankruptcies, NUMEROUS defaults on pensions, etc.