Is Nature Exposure good for longevity?

Yes — the evidence for this is strong. A systematic review and meta-analysis of cohort studies in The Lancet Planetary Health found greater green space exposure is associated with lower mortality, a finding reinforced by an independent systematic review of residential green space and by a dedicated meta-analysis in older adults finding lower mortality and cardiovascular risk. That's reflected in an evidence score of 75/100 for its role in longevity, drawn from 10 studies (1 RCT), with an estimated impact on longevity rated moderate (46/100).