Melissa Esparza is one of about 700,000 teens — or one in 30 high schoolers aged 13 to 17 — who experience unaccompanied homelessness in a given year, according to data from Chapin Hall, a policy and research center based at the University of Chicago. The center also estimates that one in 30 kids between 13 and 17 experience unaccompanied homelessness — meaning they lack both a stable residence and a parent or guardian.