Is Healthy Aging Lifestyle good for longevity?

Yes — the evidence for this is strong. A widely cited BMJ cohort study following US health professionals over decades found that people who maintained five low-risk lifestyle factors (never smoking, healthy weight, regular physical activity, moderate alcohol intake, and a quality diet) lived on average many years longer free of cancer, cardiovascular disease and type 2 diabetes than those who maintained none. That's reflected in an evidence score of 90/100 for its role in longevity, drawn from 7 studies, with an estimated impact on longevity rated substantial (90/100).