Class Groups
April 2023 – March 2024 Season
SIRC Classes are based on the Japanese Academic Year.
Children who were born between April 2nd of the year and April 1st of the following year are placed in the same grade.
See Table Below
Age Group Dates
| 2023 Academic Year | Date of birth |
| U4 | 2019 2 April 2nd ～ 2020 April 1st |
| U5 | 2018 April 2nd ～ 2019 April 1st |
| U6 | 2017 April 2nd ～ 2018 April 1st |
| U7 | 2016 April 2nd ～ 2017 April 1st |
| U8 | 2015 April 2nd ～ 2016 April 1st |
| U9 | 2014 April 2nd ～ 2015 April 1st |
| U10 | 2013 April 2nd ～ 2014 April 1st |
| U11 | 2012 April 2nd ～ 2013 April 1st |
| U12 | 2011 April 2nd ～2012 April 1st |
| U13 | 2010 April 2nd ～ 2011 April 1st |
| U14 | 2009 April 2nd ～ 2010 April 1st |
| U15 | 2008 April 2nd ～ 2009 April 1st |
| U16 | 2007 April 2nd ～2008 April 1st |
| U17 | 2006 April 2nd ～ 2007 April 1st |
| U18 | 2005 April 2nd ～ 2006 April 1st |