Zwift is slowly releasing their clubs feature, yesterday, Zwift did another wave of their release, which included approximately 10% of users on Zwift. Only Zwifters who are invited to a club, or a level 20+ cyclist, or 10+ runner. Zwift is doing a release early on every week, so keep an eye out for the clubs tab on your companion app! For more information on how to join clubs, create a club, create a club event, and everything you need to know, head over to this article: https://zracecentral.com/2022/01/11/a-complete-guide-to-zwifts-clubs-feature/.
Unfortunately riders under the age of 16 are still unable to join or create clubs. This likely will not change in the next few weeks of the release, so be prepared to wait awhile juniors!