However, as important as these factors were, one thing seemed to matter much more than anything else. It didn’t come as a surprise; it had been obvious to everyone, across the decades, as they had conducted their interviews. The most important variable in determining whether someone ended up happy and healthy, or miserable and sick, was “how satisfied they were in their relationships,” one researcher wrote. “The people who were the most satisfied in their relationships at age 50 were the healthiest (mentally and physically) at age 80.”
