This is America, where a lot people's brains remain stunted their whole lives. But at about what age have scientists determined that the brain is actually fully formed?

As explained by Northwestern University Medicine's website: "Brain development begins from the back of the brain and works its way to the front. Therefore, your frontal lobes, which control planning and reasoning, are the last to strengthen and structure connections."

Asked by Tom Cohen · Last updated 5 years ago · 14.7K views