Lots of good evidence once again that people who drink coffee live longer with l

Lots of good evidence once again that people who drink coffee live longer with less serious disease up to about five cups a day.

I am looking for a reason why the kind of people who live longer drink coffee rather than why coffee makes you live longer, and I suspect the following:

1-smarter folk/more social folk

2-middle upper middle class.

3-more active folk.

With 3 being the obvious candidate for producing longer lifespans with less disease.