Channeling the essence of lead, allowing the lead God to speak through him, it's voice angry and billowing like a volcanic ash cloud, O divine heavy metal, the spark of destruction, creation, and the cycle therein, reach into their minds and lungs, the young, the old, even the healthy, and pull out their blood so that your thirst may finally be quenched

This is seriously one of my pet theories: apparently lead is sequestered in the bones, so it would make sense that once someone hits a certain age and bone density starts dropping, that decades of lead exposure starts re-entering the bloodstream.