Aguilar was selected as a referee for the 2007 FIFA Under-20 World Cup in Canada, where he refereed the matches between the United States and South Korea on June 30, 2007, New Zealand and Gambia on July 5, 2007, and Austria and Chile on July 8, 2007. Aguilar was selected as a reserve official for the 2010 FIFA World Cup. Therefore, he did not officiate in any matches during the tournament except as a 4th official.