>unaccompanied minors
Most recent I could find:
https://fas.org/sgp/crs/homesec/R43734.pdf
Congressional Research Service
Unaccompanied Alien Children:
Demographics in Brief
September 24, 2014
Summary
The number of children coming to the United States who are not accompanied by parents or legal
guardians and who lack proper immigration documents has raised complex and competing sets of
humanitarian concerns and immigration control issues. This report focuses on the demographics
of unaccompanied alien children while they are in removal proceedings. Overwhelmingly, the
children are coming from El Salvador, Guatemala, and Honduras. The median age of
unaccompanied children has decreased from 17 years in FY2011 to 16 years during the first seven
months of FY2014. A greater share of males than females are represented among this population.
However, females have steadily increased in total numbers and as a percentage of the flow since
FY2011. The median age of females has dropped from 17 years in FY2011—the year that was the
median age across all groups of children—to 15 years in the first seven months of FY2014.