Is Social Connection good for longevity?

Yes — the evidence for this is strong. A widely cited meta-analytic review of over 300,000 participants found stronger social relationships are associated with a 50% reduction in mortality risk, comparable in magnitude to established risk factors like smoking. That's reflected in an evidence score of 85/100 for its role in longevity, drawn from 7 studies, with an estimated impact on longevity rated substantial (90/100).