The bottom line is that when members of iGen arrived on campus, beginning in the fall of 2013, they had accumulated less unsupervised time and fewer offline life experiences than had any previous generation. As Twenge puts it, “18-year-olds now act like 15-year-olds used to, and 13-year-olds like 10-year-olds. Teens are physically safer than ever, yet they are more mentally vulnerable.”