If you need to ensure that Enrollees fall within a specific age range, you can set parameters within the Program settings. Age restrictions on set on the Program level, NOT on the Class level.
NOTE: Age restrictions are based on the birthdate field of your Enroll Form. You have to have this field visible for age restrictions to work. If you create a different birthdate field, the age restrictions will NOT work.
You can set up a youngest and/or oldest age restriction. It will work if only one is set up. You can also set a date to apply the age restriction (optional).