The reality is that anyone 55+ outside of QF is not looking at huge a super balance. There are plenty of people who got wiped out at Ansett in their prime earning years only to be possibly done again in their 50's. I think a call for the over 55's to arbitrarily retire is probably a bit disingenuous given what they have been through in their career. I wouldn't have an issue with any of those folks if they wanted to hang on til 65+.
But sure if you have been in QF since you were 25 have lived through the biggest expansion period the airline has ever experienced and your biggest decision is whether to go a Jeanneau Sun Odyssey 490 over a the Beneteau Oceanis then I would agree it's time to move on.