Prefrontal cortex is a region in the brain that is involved with intellect, recall, and personality. It’s also useful in judgement, planning, and problem solving. This part of the brain develops slowly and it’s fully mature at the age of 20s and the development is influenced by social environment. Read more about the changes here.
Since this region develops slowly, when my friend said, “My crush is a good guy but I think he’s not mature yet,” we “casually” concluded that the prefrontal cortex of my friend’s crush wasn’t fully mature yet.
Hrweb.mit.edu, (2008). Young Adult Development Project. [online] Available at: http://hrweb.mit.edu/worklife/youngadult/brain.html [Accessed 9 Mar. 2015].
Marieb, E. and Hoehn, K. (2013). Human anatomy & physiology. Boston: Pearson.