Ages effective for the 2025-26 GTHL season. Player ages are determined by age as of December 31, 2025.
| CATEGORY | BIRTHDATES |
| U21 | Born in 2005, 2006, and 2007 |
| U18 | Born in 2008-2009 |
| U17 | Born in 2009 |
| U16 | Born in 2010 |
| U15 | Born in 2011 |
| U14 | Born in 2012 |
| U13 | Born in 2013 |
| U12 | Born in 2014 |
| U11 | Born in 2015 |
| U10 | Born in 2016 |
| U9 | Born in 2017 |
| U8 | Born in 2018 |
| U7 | Born in 2019 |
| U6 | Born in 2020 |
| U5 | Born in 2021 |
