A friend working for the regulator here in the Southern hemisphere recently explained the ICAO changes that become effective in November.
Pilots may continue to fly in command until age 65, provided that another pilot in the crew is under 60.
An ICAO member state may choose to apply more restrictive regulations (i.e. PIC must be less than 60) however it cannot prevent pilots of another ICAO member state (i.e. one which allows pilots to fly until 65) from flying into their airspace and airports. Thus if an Australian PIC who is 64 years old wants to fly into France in an Australian-registered aircraft, and using an Australian licence, then there is nothing the French can do about it.
Sorry I cannot refer you to an ICAO website to confirm this.