A new study quantified young-onset dementia frequency across 204 countries and territories, and on regional and national levels — and found that it skyrocketed between 1990 and 2021.

Genetics played a surprisingly minor role in overall longevity. Age and sex explained 47% of the variability in mortality, ...

From 2011 to 2023, there was an increase in early adult mortality in the US, with further acceleration seen during the COVID-19 pandemic.