High performance tournament

[grandmeadowhockeyfan]

Anyone out there want to help me understand
This tournament. The kids have to be 18. Is that
A junior in high school. Also how long do this kids practice
Together before the tourney starts. What are the benefits
And negatives of the tourney.

[DKS1962]

1994 birth years. Some are seniors and some are juniors. I don't know how they pick the team.
The 17's and down have a try out for their section team.