Aaron attended high school in Houston at St. Thomas High School and lived with his grandparents. Described by the Houston Chronicle in November 2008 as a "freshman phenom", he got 16 points in his first game with the team. In 2010, he was named by the Texas Association of Private and Parochial Schools to its second-team Class 5A All-State Boys Basketball Team. Aaron left St. Thomas High School for Houston-area Fort Bend Bush High School, graduating in 2011 as a three-star recruit according to Rivals.com and Scout.com.
