I have seen the exact opposite as, aside from obesity problems, each generation I've seen has had significantly higher life expectancy than the last.

I know multiple people now who have outlived the short life expectancy their health complications in the 80s supposedly gave them. I know a few families who have people living longer than anyone else in their blood line ever has. The heart and lung problems that killed off my grandparents have been dealt with now and my parents and my generation are already outliving them and far healthier at our ages.

This is all thanks to great medical advancement, of course, but the point is this isn't some dire threat that warrants doom and gloom, but another medical hurdle for us to be aware of and work out like we have all the others.