"There were 12 million immigrants living in the country illegally as of January 2015, according to the most recent estimate from the Department of Homeland Security. The estimates from two independent groups are similar: The Pew Research Center estimates the number at 10.7 million in 2016, and the Center for Migration Studies says there were 10.8 million people in 2016 living in the U.S. illegally."
https://www.factcheck.org/2018/06/illegal-immigration-statistics/
""all able-bodied male citizens of the United States and all other able-bodied males who have . . . declared their intention to become citizens of the United States," between the ages of eighteen and forty-five."
https://constitution.congress.gov/browse/essay/artI-S8-C16-1/ALDE_00001078/