Aman was the inaugural winner of the 1000 metres race at the 2010 Youth Olympics in Singapore. He won a silver medal in the 800 m at the 2011 World Youth Championships in Athletics, coming in secong behind Leonard Kirwa Kosencha who set a world youth record. He ran an Ethiopian record to win his semi-final heat at the 2011 World Championships in Athletics, but finished last in the event final.