Here's the text of the order: https://www.bouldercounty.org/families/disease/covid-19/publ...
The text says in part: ""Gathering: more than one individual coming together or being physically near each other for any shared and common purpose, including socializing or participating in any activity together including but not limited to shopping, dining, or exercising. A gathering does not include employees of any business while performing work for that business or any classroom learning activity explicitly permitted by the University of Colorado. Members of the same household while in their shared household space (e.g. a dorm room) together are not considered a gathering.""
They've excluded people at work, so I suppose this allows people in this age range to provide childcare for essential workers, work in health care or at grocery stores, etc.