Want to live longer and healthier? Try these science-backed tips.

After more than a century of steady, upward climb, US life expectancy hit 78.9 years in 2015. Since then, it’s been mostly downhill. US life expectancy slid to 76.1 years in 2021 at the pandemic’s nadir before inching back up to 78.4 years in 2023 — still well below the 2014 peak and