My uncle who is 99 and still has one sister at 101. Some of his family members passed at 104, 102 and 99.
I asked him what happened to his other six siblings, He replied, "they all died young, they were in their seventies". His perspective was 70's was too young.
My mom who passed in her nineties considered a seventy something person to be "just a kid".
My perspective is "it's all about quality of life".
I've seen several family members who don't have quality of life and they wake up in the morning with nothing to look forward to as they are too sick.
IMHO
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).