Read another response by Thomas Pogge
If someone died at age 95, we wouldn't think him unfortunate--it isn't a bad thing, for him, not to have lived much longer. However, if someone died at age 15, we would thing him unfortunate. Why? I suspect that our intuition here has to do with the fact that 95 is well above the average life expectancy for humans, while 15 is well below average. But why should that matter here?