Is Running good for longevity?

Yes — the evidence for this is strong. A meta-analysis and large cohort study both show that running, even in modest weekly amounts, is associated with meaningfully lower all-cause and cardiovascular mortality compared to not running, and broader cardiorespiratory fitness meta-analyses support the same general pattern. That's reflected in an evidence score of 70/100 for its role in longevity, drawn from 4 studies, with an estimated impact on longevity rated substantial (72/100).