It would appear that Circuit Overseers (no DOs these days I guess) are taken off at 70 years old. Even older ones in Bethels are disposed (sorry 're-assigned to the field) of before they get too past it.
How come though the old boys on the GB aren't shown the door at 70 and replaced by younger men - obviously of the recently anointed type? They don't look a particularly fit bunch so they can't claim special mightiness because of doing 'the Lord's work'. (unlike the Biblical Joshua who said at 85 he was as strong as he was 40 years earlier).
Seems like one rule for some and a different one for another.
I heard that one CO in UK kicked up a fuss about being put out to grass with no pension but don't know what became of him.