Is it not? To me, an 18 year old getting mown down on a beach is a much larger tragedy than an 85 year old dying.
Edit: I meant this as a joke, albeit in poor taste, I see it was not received well.
That being said, I do think that relativizing deaths in terms of "opportunity cost" does lead to some somewhat unpalatable moral conundra.
Hard to argue with it. But it does lead to some places mainstream american morality would consider unpleasant.