What the **** do old retired ATP fellas want a job for, especially in another country? OK, their own country won't give them a job, so they become mercenaries and take a job in somebody else's country.
Have they nothing else in their lives to occupy themselves in their twilight years?
They occupy a seat that a young guy could, and should, occupy. They've had their careers and through nothing more than greed want to keep going. There's no sense in being the richest pilot in the graveyard.
I bailed out as soon as I could afford to do so, and I recommend retirement to everybody. Age of retirement is irrelevant; just have a plan to spend your time, and say goodbye to simulator checks, Emg Reval, CRM, hosties, management (especially management), pax, and all the other bull$hit that goes with work. I've never been so busy, and I know it's a cliche, but I don't know how I found time for work.