There are so many nuggets of gold in this article that I don’t know where to start. For example:

What allows people to work, and love, as they grow old? By the time the Grant Study men had entered retirement, Vaillant, who had then been following them for a quarter century, had identified seven major factors that predict healthy aging, both physically and psychologically.

Employing mature adaptations [better known as “defense mechanisms,” and described in detail earlier in the article] was one. The others were education, stable marriage, not smoking, not abusing alcohol, some exercise, and healthy weight. Of the 106 Harvard men who had five or six of these factors in their favor at age 50, half ended up at 80 as what Vaillant called “happy-well” and only 7.5 percent as “sad-sick.” Meanwhile, of the men who had three or fewer of the health factors at age 50, none ended up “happy-well” at 80. Even if they had been in adequate physical shape at 50, the men who had three or fewer protective factors were three times as likely to be dead at 80 as those with four or more factors.

Here’s another one, which suggests (to me) that our political leanings might be something we’re born with:

[…] He also found that personality traits assigned by the psychiatrists in the initial interviews largely predicted who would become Democrats (descriptions included “sensitive,” “cultural,” and “introspective”) and Republicans (“pragmatic” and “organized”).

Sponsoring this kind of “longitudinal study” sounds like a really good way to employ obscene amounts of wealth.