True, but the graph show lots of people dying in their 20s and 30s. So if I was born in 1940s and became a heroin addict there's a good chance I die before 1979. So those born before 1950's are unlikely to die of a drug overdose between 1979-2016 because to do so they would have needed to become in contact with heroin for the first time well into their 30s instead of their teens and 20s.