The National Institute of Health has released findings from brain researchers that explain why 16 year-old drivers have such higher car crash rates than teens who are just a few years older. Scientists have proven that the dorsal lateral prefrontal cortex of the human brain -- the part that make decisions about risks and controls your impulses -— does not fully mature until age 25. The findings could have broad implications from everything from the age at which we license drivers to the age at which we allow the purchase of alcohol. A recent USA Today/CNN/Gallup Poll found 61% of Americans think a 16 year-old is too young to have a driver's license.