Anyway, I'm not 60 or 65 yet but perhaps someday I will be. Or not, we'll see.
Don't know how Continental does the augmented crew on the 777. I believe they have two captains and two FO's on the EWR-PEK run but for Europe it appears they have a captain and two typed FO's.
I've been one of two FO's on an Atlantic crossing with an incapacitated captain years ago. Technically, as the right seat FO I was second in command although the relief FO was senior to me. All of our FO's were type rated except for a couple who couldn't pass the ride. The captain was having an apparent kidney stone attack and was in too much pain to fly or even sit in his seat.
We agreed that I would land the aircraft from the right seat since that was where I was proficient, with the relief pilot in the left seat. The aircraft had steering tillers on both sides so taxi was not an issue. A couple of hours out the captain's condition improved dramatically and he was able to sit in his seat while I made an uneventful landing.
I've seen and heard of almost every permutation of the three pilot augmented crew, sometimes everyone type rated, sometimes two captains, sometimes two FO's, sometimes the relief pilot is second in command sometimes he or she is not.