Players born in 2004 must register with the RMLL (Rocky Mountain Lacrosse League) as they are now considered Junior players and have aged out of minor lacrosse.
See the links to the Rocky Mountain Lacrosse League site regarding 2004 born players and registering your intent to play.
17U Division Update Explanation https://rockymountainlax.com/ala-17u-division-update-december-9-2020/
RMLL Information for New Players (born in 2004) https://rockymountainlax.com/rmll-info-for-new-jr-a-and-jr-b-players/
Link to Register your Intent to Play for the RMLL https://rockymountainlax.com/intent-to-play/