With age 65 I forget how long but two over 60 could not be in the seats at the same time. FedEx just pulled the over 60 FO and put a younger guy in it. I don’t remember if the over 60 FO was pay protected or not. Eventually I think the over 60 FO could see the over 60 bid awards and bid around their schedule
Was a pain for the company scheduling but they figured it out.