I've wondered about that, but remember: Our lives today are much longer than those of average Americans of 100 years ago. Everyone's grandparents can tell (could have told) you about more than one sibling or friend who died at an early age from some disease or genetic malady that just isn't a problem today.
I know extreme safety is a faddish value in our society today, but I think it's more because Baby Boomers haven't really known privation or hardship like our Depression/WWII parents & grandparents did. If the War on Terrorism became WWIII, we could see the Generation Z grow up with quite different attitudes towards death than Boomers. "Using up one's life well" as opposed to "extending one's life at all costs", in a way.
Generation Z??? Now, is that like Dragonball Z? If so, then kewl! No, the Baby Boomer attitude on death can be basically summed up by the phrase "Am I in the will? Huh, huh, am I???"