We can all be harmed by exposure to lead.
Children under the age of 6 years old are most susceptible because their nervous system is still developing. They are also most likely to come into contact with lead contaminated objects because they put their hands or other objects into their mouths. Pregnant women are also at risk as lead that the mother is exposed to can pass to the unborn baby.
People living in older housing (pre 1970s) may have lead water pipes or paint.