Kids first of course but it can't be right if a seventy year old woman on a sinking ship gets preference over a 19 or 20 year old lad who's just starting his life.
if the captin has gone then its the surivel of the fittest
That's a very specific example, and I'd agree with you on that one. But at the moment in the sinking ship situation we have this "convention" which almost compels any young man regardless of character to stand aside for any woman regardless of hers. If not and he survives, questions and ridicule would probably be heaped upon him.