except the sentence I quoted from the report says it's talking about previous exposure in childhood. The original point I was responding to say half the populat

except the sentence I quoted from the report says it's talking about previous exposure in childhood. The original point I was responding to say half the population; children are less than a quarter of the population. "...yesterday's children, who are victims of what we term legacy lead exposures. We estimate that over 170 million Americans alive today were exposed to high-lead levels in early childhood, several million of whom were exposed to five-plus times the current reference level"