ICAO didn’t change 65 because the US did, you have the exactly opposite. ICAO moved up to 65 and the FAA followed suit after Congress changed the law.

In case you haven’t been paying attention there have been massive labor strikes in Europe over raising retirement ages…. So if you’re hanging your hat on “ICAO will do what the US does” you’re delusional.

Remember when the entire globe grounded the 737 max even though the FAA was saying it’s safe? Yeah that’s how much they GAF about anything the FAA says. Kinda like how EASA and CAAC refuse to give the 737-7/10 certification waivers for EICAS like they got in the US. We have no clout, and the rest of the world doesn’t care.