Earlier quoted context omitted.
Not sure if I follow your point? Are you saying this is less of a tragety because these people lived 50 years longer?
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.