It's all very well for the law to say that you can carry on to 65 but people grow older at different rates and I've flown with a few near 60 years old who really should have been retired. 5-6 days on, early starts and high intensity short-haul in busy airspace takes it out of me now, can't imagine being up to it aged 65. Granted there will be those who would still be up to it at 70, I know a few, but I can see an awfull lot of awkward and pride destroying sessions in the sim coming up if 65 becomes the norm. Not easy to take someone to one side and say "no more", pretty rare now but not in the future I fear.