Should we be scared of everyone living longer?

100 used to be a semi-unattainable age. It still mostly is, but more and more people will get there -- to the point that The Atlantic did a cover story on that topic, which I just read on a plane. (Interestingly, the U.S. average life expectancy is about 78.7 years, which is only 26th out of 36 OECD nations -- and the figure ranks below the 80.1 OECD av…