From the MLS website: http://www.mlssoccer.com/news/article/2011/08/18/postcard-mexico-russo-gets-dream-chance-boca
He's a late year '94 (11/8/94), so he just misses being eligible for the 2015 U20 team, and would be extremely young for the 2013 U20 team, and that's assuming that he develops well.
An update on Nicolas: http://www.mlssoccer.com/news/article/2012/01/18/gringo-report-russo-leaves-boca-juniors-orlando