The average age of the user was 26 - 35. (ocgov.net)
In particular, Guttmannová said, future studies should address specific dimensions of marijuana policies, timing of policy change and implementation, and different aspects of marijuana and alcohol use, such as age of users and whether they are episodic or regular consumers. (sciencedaily.com)
Ong says that ages of users range from 21 to 38, and so far the user base is slightly skewed towards women. (entrepreneur.com)