If the posters referencing the 75 limit for Senators are suggesting that 75 is the normal retirement age in the Federal Sector, perhaps there is room for negotiation with the Fly Past 60 group.
Then that just becomes another case of a group negotiating away individual rights, only at a different age. Once it reached the CHRT challenge stage any chance of an accommodation disappeared. The next step for ACPA and Air Canada once they open their eyes and see the reality will be making a BFOR case for 65.
If they were smart they would have been doing that from the get go knowing they didn't have a chance of winning age 60.