People who live long, healthy lives have these 9 things in common—'I call them the Power Nine,' longevity researcher says

The best-odds prescription for a long, good life is a baseline of mainly PNS arousal with mild SNS activation for vitality, combined with occasional SNS spikes for major opportunities or threats.

And thus, the Harvard Study of Adult Development was born. The original cohort of 268 men included people from many walks of life, including some who went on to become well-known, such as John F. Kennedy and Washington Post editor Ben Bradlee. Still, over the decades it was deemed too demographically insular—all Harvard men!—to give generalizable r

The best way to live is to value only what has endured.