“Life expectancy at birth decreased 0.1 year from 78.7 years in 2015 to 78.6 in 2016, largely because of increases in mortality from unintentional injuries, suicide, and Alzheimer’s disease, with unintentional injuries making the largest contribution. This is the second year in a row life expectancy has declined (1). Changes in death rates at younger ages have a larger impact on life expectancy than changes at older ages. The increases in death rates at the younger ages from 2015 to 2016 resulted in the decrease in life expectancy observed during that period.“

PS I got this link from another commenter here.