Is Purpose in Life good for longevity?

Yes — the evidence for this is strong. A dedicated meta-analysis found greater purpose in life is associated with lower all-cause mortality and fewer cardiovascular events, and this is corroborated by independent large cohort studies rather than resting on a single dataset: a UK Biobank analysis linked meaning in life to lower all-cause and cause-specific mortality, a US national cohort found life purpose predicted mortality in adults over 50, and an early landmark study found purpose in life predicted mortality among community-dwelling older persons. That's reflected in an evidence score of 80/100 for its role in longevity, drawn from 8 studies, with an estimated impact on longevity rated substantial (76/100).