Some additional notes regarding the recognized group events by USA Swimming: The 25 event is specifically for short courses and is limited to participants who are 8 years old and under. The 100 IM event is exclusive to short courses and is not an approved event for participants who are 13 years old and above. USA Swimming has one group specifically for swimmers who are 10 years old and under. While some clubs consider 8 years old and under as the Mini Group and 9-10 as the upper group. At SwimStandards, we categorize them as follows: 8 & Under (Mini), 9-10 (Midi), 11-12 (Juni), and 13 & Over (Maxi).