Aerents qualified for two swimming events at the 2012 Summer Olympics in London, by clearing a FINA B-standard entry time of 22.42 (50 m freestyle) from the Nancy Long Course Invitational in Nancy, France. He also teamed up with Dieter Dekoninck, Emmanuel Vanluchene, and Pieter Timmers in the 4 × 100 m freestyle relay. Swimming the second leg, Aerents recorded a split of 48.34, but the Belgian team rounded out the finale to last place in 3:14.40. In the 50 m freestyle, Aerents topped the fifth heat by 0.21 of a second ahead of China's Shi Yang in 22.43, just a 0.01-second deficit from his entry time and personal best. Aerents failed to advance into the semifinals, as he placed twenty-second out of 58 swimmers in the preliminaries.