Re: So...
In the 'young vs. elderly' situation, people will assume the elderly is a pensioner whose costs to the society (pension, health...) outweigh their current contribution, whereas the young person still has a lot of potential.
Costs and contributions? Bloody hell. Are you a Randian?
My decision to favour a child ahead of an elderly person comes from imagining that I, as a driver, chose the opposite, and the elderly person hauling me out of the blood-splattered wreck of a car to furiously berate me over choosing to kill someone with 70 years ahead of them rather than someone with maybe only five years left.