I think you should analyse your situation with survival logic. If you were in a situation where the continuation of the human species was at stake your decission instincts should be the following. Young females (future reproduction) are saved first with at least one male young. Older females are saved next. They can still reproduce and take care of the young being saved. Enough strong males are saved to continue the species. In your scenario, mature men may not be needed in the life boat since if the woman and children can survive without them.
My guess is that all ethic decissions are rooted in deep survival logic; eventhough, your "survival logic" may be different from some elses. Christian and any successfull theist values have strong "survival logic". If they did not, they would not be around long.
As usual, I'm late to this party. Nevertheless . . .
I suggest the best solution to the lifeboat problem is for the person who has the power or authority to decide the order of boarding ( "the Captain" )to make a selection based on the passengers value, as he is able to determine that. If he has a young Einstein or Ghandi, they get on the lifeboat first because they are the most valuable in his opinion. If a young Lizzie Bordon, although perhaps she she seems an attractive breeder, she would be among the last.
The Captain, like all of us is biased and has incomplete knowledge and insufficient wisdom to select by value accurately, and he is wise enough to recognize these limitations. He does have the power to enforce his selections, therefor not to do so would be, for him, immoral. It's absurd to select by any criterion other than anticipated future value. Value is, of course, subjective.
I'd just tell him, "Screw the lifeboats, it's all about sea turtles, mate!"
If you can't beat em*, confuse em...
*make no mistake, you can't beat em when the question is a loaded hypothetical with infinite possibilities for moving goal posts. i.e. you suggest women and children, they reply young Hitler is on board, etc. etc. ad infinitum et nauseum.