Why is Bart older in Flash: The Fastest Man Alive?
During Infinite Crisis, Bart and other speedsters trapped Superboy Prime on another earth beyond the speed force. Time flowed at a different rate there. Four years passed for Bart, while only hours or days passed for the rest of the world. In The Flash: The Fastest Man Alive #1, Bart said that “a year ago” (i.e. right before Infinite Crisis) he was 16. He was 20 when he returned, and “one year later” he would be 21. After returning from the dead in Final Crisis: Legion of Three Worlds, he is a teenager again.
