The fact that the ICAO regulations may change does not effect the rights of individual operators to continue with the " combined 120 rule". This is not age discrimination etc etc, if an operator wants to let you fly a desk or just sit on the jump seat it's entirely up to them. Many companies have fixed term contracts, when the contract is up, thats it, game over. Personally, I have no desire whatsoever to fly until 65! I hope I will have earned enough to retire and enjoy life. I suspect the class one and other OMLs will do a fair bit of " natural culling"