Loose Rivets
"I have, in my last years flying, jumped a jet transport flight in the UK which was crewed by a 60+ and a <300 hour pilot. The young man was technically a smooth operator until the height-lock was missed by the PF (the Capt) and also the F/Officer. I left it as long as I dared before prompting. My formal assessment of that incident, was that the Captain's distraction was valid in this case, but that more careful monitoring of the flight by the PNF should be ....'encouraged.' "
So nothing to do with hours and experience then. The old blokes in your company are just as incompetent as the young inexperienced ones.