Scientists are discovering that even though lead has been phased out of our environment, those elderly who were exposed decades ago are still feeling the effects. Apparently lead exposure back then has a strong link to their mental decline now.

This flies in the face of what many considered to be a "natural aging" of the brain's decline. However, researchers are quick to note that this is not the sole cause of mental decline as the years wear on. What they are saying is that this exposure has accumulated in their bodies, and still affects their health decades later by causing the brain to work like it's five years older. We live in a time where almost everything we touch is treated with a chemical. But the problem back then was that they didn't realize the full effects of lead.

Thankfully environmental levels dropped dramatically starting in the mid-70's so that by 1990 the amount of lead in the average American had dropped by 80 percent. However, lead in the bone which was contracted in the past can still be measured today (everyone has some level of it in their bodies). More research is needed to figure out the mechanism by which lead stays in the system and how it influences brain aging. Hopefully they can pin it down and cut lead out of our every day interactions even more.