Aged Crew
As a now retired 68 year old F/E I think the nurse on standby for the F/E mentioned by 411A would not be there to give medical treatment, but to assess his 'capabilities' post flight!!! Seriously, a good mate has just retired at age 67 + 9 months, not because he could not meet any medical or operational requirement, but rather because his company has pensioned off their B727F's.