When it comes to the development of the human brain, the frontal lobe plays a vital role. The frontal lobe is responsible for cognitive functions such as decision making, problem-solving, attention, and emotional regulation. It is one of the last regions of the brain to fully develop, and its development can be affected by various factors such as genetics, environment, and experiences. In this blog post, we will cover everything you need to know about frontal lobe development, including how developed the brain is at 21, what affects frontal lobe development, at what age the frontal lobe is fully developed, and how to identify an underdeveloped frontal lobe., Research has shown that there are some differences in male and female brain development. For example, the frontal lobe, which is responsible for executive functions, continues to develop until the mid-20s for both males and females, but research suggests that males may experience slower development in this area., The study found that parts of the frontal lobe, responsible for problem-solving and decision-making, and the limbic cortex, responsible for regulating emotions, were larger in women [source: Hoag]. In men, the parietal cortex, which is involved in space perception, and the amygdala , which regulates sexual and social behavior, were larger .