How old do I have to be to use Facet? Jackie March 29, 2022 19:39 Updated You must be 18 or older to use Facet. If you are 18 or older, you can get started with Facet here. Related articles Am I eligible to use Facet? Where will my prescription be filled if I order through Facet? How much do the treatments cost? Is Facet a subscription service? Are generic drugs the same as branded drugs? Comments 0 comments Article is closed for comments.