Spifmeister

Yes, X is not the only one to consider when Y wants to make the sacrifice, and yes Y sacrifice will harm his emotional dependents but,

If the benefits that X would receive from Y sacrifice out way the harm done to his/her emotional/economic dependents. Then the act is moral.

i.e. Thought Y sacrifice will hurt her/his loved ones, the loved ones understand and accept his sacrifice for X.
and Y loved ones can live economically without her/him

If Y sacrifice does more harm to his emotional/economic dependents, then the benefits that X would receive. Then the act is immoral.

i.e. Y loved ones do not understand why and/or more importantly cannot accept Y sacrifice for X.
or Y loved ones cannot live economically without him/her.

If Y does not consider his/her emotional dependents.
Then the act is immoral.

tronvillain

Yes, Person Y should be allowed to surrender his life so Person X can live, since I have no problem with people choosing to die. It doesn't matter what age the people are as long as the one choosing to die is capable of consent, and the genders involved are completely irrelevant except perhaps medically. Oh, and the interests of neither individual are more important, except from a given subjective perspective (from mine neither are more important).