According to USA Lacrosse's age segmentation policy, for play occurring between September 1, 2024, and August 31, 2025, players are grouped based on their birthdates to align with school grade levels. For 3rd to 5th-grade girls in lower school, the typical age groupings are as follows:
- 3rd Grade (9U): Players born between September 1, 2015, and August 31, 2016.
- 4th Grade (10U): Players born between September 1, 2014, and August 31, 2015.
- 5th Grade (11U): Players born between September 1, 2013, and August 31, 2014.
These groupings are based on 12-month age intervals, with a September 1 cutoff date to align with the academic year. This means the youngest players in 3rd grade would have birthdates on September 1, 2015, and the oldest players in 5th grade would have birthdates on August 31, 2014