In this paper, we address the moral justification problem concerning the use of age as a criterion for the allocation of scarce life-saving medical resources. We present and discuss four justifications that stand out in philosophical literature: efficiency, sufficiency, egalitarian, and prioritarian. We aim to demonstrate that all these justifications are unsatisfactory since they entail counterintuitive implications in cases involving fetuses and newborns. We then suggest another justification for the relevance of age based on the Time-Relative Interest Account of the (...) harm of death. Finally, we evaluate an objection that could limit the scope of the defended justification, leading us to draw a distinction between justification of harm and strict justification of harm. (shrink)