You can customize the age groups to meet your needs, such as adding or removing age groups, or using ages instead of grades.
Go to into the settings section and select "Age Groups." You can rename the existing age groups, delete any you don't need, and add whatever additional ones you do. You also can reorder them by dragging the icon at the left of each age group field.
Once you have your age groups defined, you'll probably want to go to the "Team Settings" to be sure ages are being assigned to teams the way you want,
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