Mississippi has the lowest life expectancy in the US.Chad Robertson Media/ShutterstockA new study suggests human life expectancy is plateauing.In 2022, life expectancy in the US was 77.5 years, but values vary across states.Hawaii has the longest life expectancy, while Mississippi has the shortest.As anti-aging regimens and longevity treatments continue to gain traction, a new study suggests that humans may have reached a roadblock on their quest for longer lifespans.On Monday, Nature Aging published an analysis suggesting human life expectancy is plateauing after decades of progress.Lead study author S.