late-twenties (Giedd, 2004) and the questionably mature disposition of individuals in this late adolescent age range. As such, it is quite possible that individuals who are only a few months apart in age (e.g., a 17-year-old and an 18-year-old) are classified as an adolescent and adult, respectively (Geier et al., 2009) which begs the question of whether the adult comparison group is truly an accurate comparison group.
