Is life expectancy dropping because millennials are dying? My understanding is that it's due largely to the opioid crisis, which mostly affects people in older generations.
The opioid crisis isn't limited to older generations, it's definitely impacting millenials as well[0]. The millenials that are most likely to be impacted just tend to be from more economically depressed areas.
My anecdata is that I know 4 people from my graduating class who are dead today because of opioids. I don't know what the rates are, but it definitely affects the young as well.
Depending on the source the millennial generation is usually considered to start around 1980-82, making them currently 36-38. Speaking only for myself (age 34) I've seen and heard about many people that I grew up with getting caught up in opioid addiction.