If a pilot wants to fly to 70 and they are fit enough, fine.
Just how scientists can test cognitive agility given that they don't even have an OBJECTIVE, REAL TIME test for fatigue levels, I don't know.
In RYR everyone knows what you get in the sim in advance anyway, so no real test of the old grey matter there then.
In any case, someone who has spent over 40 years gawping at a primary flight display and wants to do 5 more years gawping at a primary flight display can't be all there anyway !
Come on guys there is more to life than floating about 37,000 feet away from where all the fun is ( The Earth for those who have forgotten !).