Until ICAO changes the age I’m not really sure how the age can change. Last time it changed the United States was just aligning with the rest of the world - it was a seamless transition.
So how will it work this time? Pay protect pilots for trips that go international? Drop trips without pay? Displace over-65 pilots to NB? Is that even allowed per the UPA? It would be chaos to figure out how to do it.
There are so many moving parts to this that I personally don’t think it’ll be changed until ICAO gives the nod.