I remember reading something when I was a teenager (about 50 years ago) that during the Second World War, when the European Merchant Marine transport boats were being sunk, it was the older sailors who were the more common survivors. They had been fishermen all their lives and used to long hours in very uncomfortable seas, knowing they just had to 'tough if out' and not give up. The young sailors just didn't have the right mind set for survival.
Stitchawl