Josephine Langford was 18 in Pulse when she played the character 'Student'.
That was over 7 years ago in 2017.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 26, and has starred in 11 movies in total, 8 of those since Pulse was released.
In Pulse, I think Josephine Langford looks: