This subject troubles me because, about ten years ago, I was struck by the number of people of my parent's generation who were suddenly dying in their 50s and 60s, despite seeming relatively healthy -- exercising, eating well, not alcoholics etc.
The weird thing was that most people I knew in my grandparents' generation were hitting 85 or more. My own grandmother is 96 this year. And it was on both sides of my family, so massively different ethnic origins and upbringing in other countries.
The poverty they'd grown up in was acute (my grandfather was starved and worked to exhaustion in a camp during WW2). There'd even been alcoholism in a few cases. I mean, my English family grew up and lived their lives in a mill town where you couldn't see the valley from the hillside because of the smoke. Yet they all lived into their 80s and beyond; I have great aunts and uncles that are still alive in their 90s, while my own mother has died.
It's also true of DH's family. The pre-45ers are all living a really long time, but those born after seem to be dying earlier.
I also live in an area where a nearby village has an unusual number of women in their 90s (again, my grandmother's generation).
It doesn't seem to make sense. So I started asking my grandma about her generation, and a lot of the earlier deaths among her peer group were either war deaths, or industrial accidents or work-related diseases (emphysema etc). She'd only known of two cancer deaths, both women, below 60 in her cohort.
It made me wonder whether there was something about postwar cultural and lifestyle changes that have shortened lifespan for the baby boomers, despite legislation removing many environmental and work-related hazards. Or whether there was something about the Silent/Greatest generation that expanded their lifespan.
I have wondered whether it is something dietary because, by conventional thinking, there's no other viable factors I can find.