CHinecap.........a slight correction to your post; your Boss wasn't the last Boy Entrant to serve - I was a Boy Entrant and I'm still here - albeit as an Auxie and still doin' the biz.........
BTW over 50's are exempt the fitness test - certainly in my neck of the woods and a bloody sensible idea too!! I don't need to prove to the system that I can survive or do the job properly by jockstrapping my way round any fields - personal pride & adrenalin are wonderful things!